Champions

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Some monsters can spawn as a Champion which deviates in coloration and size. The champion's coloration/size denotes which peculiar behaviors and traits it will exhibit. Champions will generally drop a pickup (coinciding with the color of the champion) when killed on normal difficulty. However, in hard mode, the drop rate is reduced to 33%, while in Greed Mode, champions won't drop pickups at all.

Most champions have a visual 15% size increase, inflict full heart damage regardless of chapter, and have double the health of a normal monster. Champions are generally regarded as more dangerous than common monsters.

Champions always deal contact damage, regardless of what monster they are (e.g. a common Mulligan will not deal contact damage, but champion versions will).

The identifying scheme for champion qualities is as follows. The rarities are only a rough estimate and may be different in stages where some varieties are not generated:

ID	Appearance	Effect	Drop	Rarity	Notes
0	Red	×2.6 amount of HP.	Red Heart	Common
1	Yellow	Increased movement speed. ×1.5 amount of HP.	Battery	Common	Doesn't appear until entering Caves and its alts, or Depths and its alts in Greed Mode.
2	Green	Leaves Green Creep as it walks.	Pill	Common
3	Orange	Attacks cause you to drop pennies (like Greed or a Hanger). The number of pennies dropped range from 1-3, which take away 2-4 pennies in total respectively. No pennies are dropped if you don't have any.	1-3 Coins The coins will appear stacked on each other and can be picked up all at once.	Around 2× rarer than common champions.
4	Dark Blue	Decreased speed.	3 Blue Flies	Around 2× rarer than common champions.
5	Dark Cyan	Explodes when killed.	Bomb	Common
6	White	Invincible until all other enemies are killed. If there is more than one invincible champion in the room, they ignore themselves in order to prevent a softlock.	Eternal Heart	Around 10× rarer than common champions. Around 20× rarer than common champions.	Doesn't appear until entering Depths and its alts, or Sheol in Greed Mode.
7	Gray	2/3 health, decreased speed.	Key	Common
8	Translucent	Tears become spectral tears, and it can move past environmental obstacles (such as pits) that it otherwise couldn't when forced.	Locked Chest Small chance to drop a Mega Chest instead.	Around 10× rarer than common champions.	Doesn't appear until entering Depths and its alts, or Sheol in Greed Mode.
9	Black	Fades in and out of visibility, like a Nulls.	Red Chest	Around 10× rarer than common champions.	Doesn't appear until entering Depths and its alts, or Sheol in Greed Mode.
10	Magenta	Periodically shoots short-ranged blood shots, similar to Gushers.	Nothing	Common
11	Violet	Pulls Isaac and his shots towards itself, like a Gaping Maw.	Random trinket	Around 10× rarer than common champions.	Doesn't appear until entering Depths and its alts, or Sheol in Greed Mode. If killed while gold-petrified (i.e. Midas' Touch), the trinket it drops is guaranteed to be golden.
12	Dark Red	Collapses into a flesh pile upon death and regenerates if not finished off (like a Globin).	Double Heart	Around 2× rarer than common champions.
13	Light Blue	Releases blood shots in 8 directions when killed.	1/2 heart	Common
Afterbirth
14	Camouflage	The enemy blends into the background and briefly becomes visible when damaged.	Rune or a random card if runes/soul stones haven't been unlocked.	Around 4× rarer than common champions.
15	Pulsing Green	Splits into two copies of itself upon death.	2 normal versions of itself	Around 4× rarer than common champions.
16	Pulsing Gray	Repels Isaac's shots when it pulses.	Nothing	Around 4× rarer than common champions.
17	Light White	Has 1-2 Eternal Flies circling it. Spawns another fly upon death.	Attack Fly	Around 4× rarer than common champions.
18	Small	2/3 health, increased speed and pitch of sound effects. 50% smaller both visually and collision-wise, making them more difficult to hit. Small champions' shots do not deal increased damage.	One Makes You Small pill at 1/5th of difficulty-based drop rate.	Around 4× rarer than common champions.	The pill is forced into rotation even if it was not included yet, changing all other pills matching its color into One Makes You Small pills.
19	Large	3× health, slightly decreased speed and decreased pitch of sound effects. Visually 50% larger, though collision remains the same. Deals two full hearts of damage.	One Makes You Larger pill at 1/5th of difficulty-based drop rate.	Around 4× rarer than common champions.	The pill is forced into rotation even if it was not included yet, changing all other pills matching its color into One Makes You Larger pills.
Afterbirth+
20	Pulsing Red	All other enemies in the room regenerate health at the rate of 20 HP per second while this enemy is alive. Other healing champions in the room cannot be healed. Bishops cannot be healed by this champion.	Red Heart	Around 10× rarer than common champions.	Doesn't appear until entering Depths and its alts, or Sheol in Greed Mode.
21	Pulsating	Spawns an Attack Fly on hit. After each hit, there is a delay until the next hit results in another Attack Fly. A single Pulsating enemy can have up to 5 Attack Flies at once.	4-6 Blue Flies	Around 10× rarer than common champions.	Doesn't appear until entering Depths and its alts, or Sheol in Greed Mode.
22	Crown	6× health. All enemies in the room that are not champions will turn yellow while the crowned enemy is alive. The affected enemies will drop batteries like yellow champions upon dying, but otherwise have no extra health, speed, or damage.	2-3 random pickups	Around 10× rarer than common champions.	Doesn't appear until entering Depths and its alts, or Sheol in Greed Mode.
23	Skull	Produces a The Necronomicon effect upon death. Deals two full hearts of damage.	The Necronomicon effect	Around 10× rarer than common champions.	Doesn't appear until entering Depths and its alts, or Sheol in Greed Mode.
Repentance
24	Brown	Trails poop behind it as it walks. The poop cannot drop any pickups.	Nothing	Around 10× rarer than common champions.	Doesn't appear until entering Depths and its alts, or Sheol in Greed Mode.
25	Rainbow	Combines the effects of multiple champion types. Large: 3× health. Dark Yellow: increased movement speed. Strong Lime Green: leaves green damaging creep on the ground. Light White: has a circling eternal fly. Pure Magenta: fires an occasional blood shot in the direction it's facing. Mostly Pure Violet: pulls Isaac and his shots towards it. Dark Cyan: explode on death. Very Light Blue: releases blood shots in 8 directions on death.	A coin, a bomb, a key, a heart, a pill, a card, and a trinket.	Around 20× rarer than common champions.	Doesn't appear until entering Depths and its alts, or Sheol in Greed Mode.

The chances for Champion monsters to appear are noted in the table below:

Modifiers	Normal mode and Hard mode	Hard mode	The Void
Base chance	5%	20%	75%
Champion Belt	20%	35%	75%
Purple Heart	10%	40%	100%
Purple Heart + Mom's Box Golden Purple Heart	20%	80%	100%
Golden Purple Heart + Mom's Box	30%	N/A	100%
Champion Belt + Purple Heart	40%	70%	100%
Champion Belt + Purple Heart + Mom's Box Champion Belt + Golden Purple Heart	80%	100%	100%
Champion Belt + Golden Purple Heart + Mom's Box	100%	N/A	100%

Champion Belt adds 15% to the base champion chance. This has no effect in The Void.

• Purple Heart doubles the champion chance, and stacks with Champion's Belt.
  • Each copy of Purple Heart adds 2 to the multiplier (e.g. 6× with 3 Purple Hearts, 20× with 10 Purple Hearts). Mom's Box and Golden Purple Heart count as 1 extra copy.

Holding multiple Purple Hearts doesn't increase champion chance. Only Mom's Box increases Purple Heart's multiplier.

Champion Enemies

• The Angelic Baby (small), Eternal Fly Bombs, the bones thrown by a Big Bony, Festering Guts, Exorcists, Fanatics, Fetal Demons, and the shadow Chargers spawned by My Shadow are flagged to be able to spawn as Champions, but this is impossible to see without mods, as they aren't placed in any room layouts normally.

Champion Bosses

Bosses are also capable of being champions, but these work much differently from regular monsters as champions. Every champion boss is unique, with individualized adjustments to the attacks and AI of the boss in question, usually specializing in certain aspects of the boss's repertoire to make them harder to deal with. A champion boss may or may not have increased or decreased health, speed, and/or size in comparison to the default version of the boss, depending on the champion in question. Champion bosses are usually not strictly stronger than the default versions of the bosses, having trade-offs with certain stats being lowered and/or certain attacks being weaker or outright inaccessible in exchange for other stats and/or attacks being stronger.

Because every champion boss is unique, the following table contains a brief summation of how they differ from the default bosses. Additional details (including any changes to the differences in versions prior to Repentance) can be found in the pages for each individual boss.

The following bosses have Champion versions and are able to spawn as Champions:

Boss	Champion	Entity ID	Champion Differences
Monstro	Grey	20.0.1	15% larger. 25% more HP (250 → 312.5). Fires projectile volleys more frequently. Unable to jump off-screen.
	Red	20.0.2	Always spawns in pairs. 20% smaller. 55% less HP (250 → 112.5).
Gemini	Blue	79.0.1	Suture shoots homing tears. Contusion will drop a Soul Heart if killed last.
	Green	79.0.2	Suture and Contusion are detached from one another upon spawning. If Contusion is killed last, it will usually drop a Red Heart or Half Red Heart, but will rarely drop any other type of Heart instead ( Soul, Bone, Gold, etc).
Dingle	Black	261.0.1	Summons Spiders instead of Dips. The dash attack covers more distance at greater speed, but is only executed once before Dingle rests.
	Red	261.0.2	Creates a Red Poop instead of summoning Dips. The dash attack covers less distance at lower speed, but is executed four times in succession before Dingle rests.
Gurglings	Black	237.1.1	Spawns Troll Bombs at regular intervals instead of leaving a trail of Red Creep while charging. The Gurglings only take 5 damage from their own Troll Bombs' explosions (unless they are petrified, in which case they take the full damage). Cannot spawn Attack Flies.
	Yellow	237.1.2	3 Gurglings spawn instead of 2. Movement speed is increased. Cannot produce Creep. Cannot spawn Attack Flies.
Larry Jr.	Blue	19.0.1	15% larger. 45% more HP per segment (22 → 31.9). Reduced movement speed. Does not create poop. Has shared health between his body segments, meaning that dealing damage to one segment will deal a percentage of the damage to the other segments. Always drops a Soul Heart upon death.
	Green	19.0.2	Will occasionally shoot a projectile in the direction he's facing, pausing momentarily as he does so.
The Duke of Flies	Green	67.0.1	Spawns Moters instead of large Attack Flies. Fires blood shots in eight directions upon spreading orbiting Attack Flies. Can spread orbiting Attack Flies at any time, and will not necessarily wait to have a certain number in orbit.
	Orange	67.0.2	15% larger. 25% more HP (110 → 137.5). Spawns Suckers instead of large Attack Flies.
Widow	Black	100.0.1	Spawns Big Spiders (with half HP) instead of Sacks. Creates Black Creep instead of White Creep. Fires 6 projectiles in all directions instead of spawning Spiders.
	Pink	100.0.2	Spawns Boils instead of Sacks. Spawns Attack Flies instead of Spiders. Jump speed increased. 25% smaller. 10% less HP (130 → 117).
The Haunt	Black (Phase 1) Black (Phase 2)	260.0.1	Only 2 Lil' Haunts are present in Phase 1. In Phase 2, the Brimstone attack is replaced with spawning 1-2 Spiders.
	Pink (Phase 1) Pink (Phase 2)	260.0.2	Only 1 Lil' Haunt is present in Phase 1. 50% less HP (200 → 100) in Phase 2. In Phase 2, the Brimstone laser is bifurcated (i.e. 2 lasers are fired at once, forming a V shape) and the lasers bounce off of walls once. The blood shot attack fires 8 shots instead of 5 and is aimed directly towards Isaac rather than straight down.
Pin	Grey	62.0.1	15% larger. 25% more HP (100 → 125). Explosive Ipecac projectile is replaced with a radial burst of 6 spiraling projectiles. Fires 6 projectiles instead of 4 when jumping.
Famine	Blue (Phase 1) Blue (Phase 2)	63.0.1	Charges more often and veers towards Isaac (similar to the Dark One). He can do this attack regardless of whether Isaac is to his sides or not. Shoots six bullets in all directions instead of spawning Pooters. Triple shot attack in Phase 2 is replaced with a Monstro-esque cluster of bullets, with reduced shot speed compared to default Famine's triple shot. Will always drop a Soul Heart upon death.
Little Horn	Black	404.0.1	Does not attack with Pitfalls, Troll Bombs, or Mega Troll Bombs, but fires Dark Balls more frequently. Will not create Troll Bombs during the chain teleport maneuver.
	Orange	404.0.2	Spits out an orange Troll Bomb instead of a Dark Ball. This orange Troll Bomb deals contact damage and leaves a patch of fire (similar to Hot Bombs) that cannot damage Little Horn. This orange Troll Bomb is also used in place of regular Troll Bombs in all attacks that involve throwing Troll Bombs into Pitfalls, including the chain teleport maneuver. Takes 1 damage every time it spawns a bomb. Does not use Mega Troll Bombs.
Rag Man	Black	405.0.1	The head roll attack spawns 1-2 Spiders instead of a Ragling. Fires a spray of 3 arcing bullets instead of resurrecting Raglings.
	Red	405.0.2	Does not fire homing bullets, and instead constantly creates and revives Raglings. The Raglings spawned by this version have the same red color as Rag Man and have 19.8 HP (34% less than the normal ones).
Fistula	Grey (large) Grey (medium) Grey (small)	71.0.1	15% larger. 25% more HP per chunk (60 → 75 for full size). Spawns Boom Flies instead of Chargers (still with only 15 HP) upon destruction of the smallest chunks. Despite Boom Flies being capable of flying over pits, spawning a Boom Fly still fails if a Fistula chunk is over a pit upon being destroyed. Reduced movement speed. The largest chunks split into three medium Fistulas instead of 4, similar to Teratoma.
Chub	Blue	28.0.1	15% larger. 15% slower. 25% more HP (350 → 437.5). Spawns Boils instead of Chargers. These Boils are colored orange, but function identically to the regular version.
	Orange	28.0.2	15% smaller. 15% faster. 15% less HP (350 → 297.5). Spawns Spitties instead of Chargers.
Gurdy	Green	36.0.1	11% larger. Does not fire projectiles. Spawns monsters more rapidly.
Mega Fatty	Brown	264.0.1	15% more HP (600 → 690). Cannot use the vomit attack. Creates rock waves instead of Red Creep when landing from the high jump (similarly to The Cage).
	Red	264.0.2	33% smaller. 10% less HP (600 → 540). Shoots 6 bullets in all directions instead of leaving Red Creep when landing from the high jump. Creates Red Poop instead of spawning Dips. Vomit attack launches 4 streams of projectiles (similar to attacks used by Mom's Heart/ It Lives) with massive tear height (to the point where the projectiles are likely to fly over Isaac's head).
Mega Maw	Black	262.0.1	Spawns 1-2 Spiders instead of a Hopper with its monster-spitting attack. The Spiders are launched directly at Isaac instead of simply being deposited below Mega Maw. Does not use any flame attacks.
	Red	262.0.2	Does not spawn monsters. Does not use any flame attacks, replacing them with an entirely different set of blood shot attacks. All attacks do 1 full heart of damage.
Gurdy Jr.	Blue	99.0.1	Always spawns in pairs. 42% smaller. 45% less HP (250 → 137.5). Only uses the charging attack. Always drops a Soul Heart on death.
	Yellow	99.0.2	15% larger. 25% more HP (250 → 312.5). Spawns Super Pooters instead of Pooters. Does not fire any projectiles.
Peep	Cyan	68.0.1	Spawns with both eyes detached (like The Bloat).
	Yellow	68.0.2	15% smaller. Movement speed increased. Creates a constant trail of Yellow Creep.
The Husk	Black	67.1.1	15% larger. 56% more HP (150 → 234). Reduced movement speed. Spawns Boom Flies instead of Spiders and Attack Flies. Boom Fly explosions deal full damage to The Husk. Spawns 1-2 additional Boom Flies on death.
	Red	67.1.2	25% smaller. 25% faster. Does not spawn enemies; only fires blood shots. Spawns 1-2 Red Boom Flies on death.
The Hollow	Black	19.1.1	15% larger. Reduced movement speed. 25% more HP per segment (26 → 32.5). Each segment that isn't the head spawns a Boom Fly on death. The head spawns a Boom Fly only if killed immediately after spawning. Doesn't create any poop.
	Yellow	19.1.2	15% larger. 25% more HP per segment (26 → 32.5). Each segment that isn't the head drops a Penny on death. The head drops a Penny only if killed immediately after spawning.
	Green	19.1.3	Each segment that isn't the head may spawn a Charger on death. The head can spawn a Charger only if killed immediately after spawning. Occasionally pauses movement to fire a spread of 3 projectiles in the direction it's facing.
Carrion Queen	Pink	28.2.2	Slightly increased movement speed. 100% more HP (350 → 700). Spawns small Hearts instead of creating Red Poops. These Hearts have 28 HP. Carrion Queen loses 40 HP whenever one of its Hearts dies. Does not change behavior to bounce diagonally around the room below half health.
Polycephalus	Red	269.0.1	Summons Para-Bites instead of Round Worms. All projectile attacks are replaced with a ring of 6 projectiles.
	Pink	269.0.2	Always spawns in pairs. 50% less HP (200 → 100). Does not spawn Round Worms.
Pestilence	Grey (Phase 1) Grey (Phase 2)	64.0.1	Leaves a trail of White Creep instead of Green Creep. Shoots 6 projectiles in all directions instead of a single Ipecac shot. Spawns Trites instead of Chargers or Spitties. Cannot have more than 3 Trites active at any given time. Spawns Spiders instead of Attack Flies in Phase 2.
The Stain	Grey	401.0.1	Spawns Round Worms instead of Chargers. 2 Round Worms are spawned at a time. Cannot have more than 3 Round Worms active at any given time. Spawns Round Worms more frequently than the default version spawns Chargers. Cannot use any bullet barrage attacks.
The Frail	Black	62.2.1	Spawns in Phase 2. Total HP is 66.6% of the default version (300 → 200). This is the same amount of HP that the default version has in Phase 2 (Phase 1 has 100 HP).
The Forsaken	Black	403.0.1	Spawns Black Bonies instead of Bonies. Spawns 4 Dank Death's Heads instead of firing rotating Brimstone beams. The Forsaken becomes invulnerable for 1 second if no Dank Death's Heads were alive when it uses this attack. If any Dank Death's Heads are alive, this attack cannot be used, and The Forsaken will pause momentarily before summoning a Black Bony.
Monstro II	Red	43.0.1	20% smaller. Movement speed increased. Attack speed increased. Spawns 2 Suckers at a time instead of 4. 10% less HP (632.5 → 569.25).
The Cage	Green	265.0.1	Periodically creates a puddle of Green Creep. Never spawns Vis.
	Pink	265.0.2	Always spawns in pairs. 50% less HP (800 → 400). 50% smaller. Never uses the jump attack.
The Gate	Black	263.0.1	Has 25% more HP (500 → 625). Spawns Big Spiders instead of Leapers. Big Spiders are flung directly at Isaac instead of landing at random locations in the room. Big Spiders, like Leapers, can be harmed by The Gate's blood shots. Does not use the Brimstone attack.
	Red	263.0.2	Does not spawn monsters. Uses a different set of attacks. All attacks do 1 full heart of damage.
The Bloat	Green	68.1.1	Fires 2 Ipecac shots instead of blood shots when performing a small jump. Fires 3 Ipecac shots when jumping off-screen. Spawns 2 Chargers when creating large Creep puddles. Creates Green Creep instead of Red Creep.
Mask of Infamy	Black	97.0.1	15% larger. The heart has 25% more HP (? → 250). The heart shoots 4 homing shots in a cross formation. The mask's behavior doesn't change after the heart is killed.
War	Grey (Phase 1) Grey (Phase 2)	65.0.1	15% larger. 25% more HP (500 → 625). Summons 2 Mega Troll Bombs (rather than 5 regular Troll Bombs) when he ascends off-screen. Drops a single Troll Bomb behind him every time he charges. Shoots 6 projectiles in all directions at the start of Phase 2 and every time he gets knocked down during Phase 2.
Brownie	Black	402.0.1	Spawns up to 3 Chargers at once instead of Brownie Corns. Creates Black Creep instead of Brown Creep. Turns into 2 Dank Squirts instead of a weakened Dangle at sufficiently low health.
Mom	Blue	45.0.1	Has 23% more health (645 → 793.4). Spawns a different set of enemies: Spider Big Spider Trite Buttlicker Keeper
	Red	45.0.2	Does not summon enemies. Stomps faster and more frequently. The stomp is used repeatedly, only pausing when Mom sticks her eye or hand out from one of the Boss Doors in her room. Fires a spread of 3 blood shots from her eye when it sticks out of a Boss Door in her room.
Death	Black (Phase 1) Black (Phase 2)	66.0.1	15% larger. 25% more HP (450 → 562.5). In Phase 1, spawns Kamikaze Leeches instead of Death Scythes. Does not use The Hourglass. In Phase 2, summons Red Maws instead of Knights.

Gallery

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  Concept art for the champion versions of the Nest.

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