Host Hat
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Host Hat is a passive item added in The Binding of Isaac: Afterbirth.
Effects
- Enemy shots that hit Isaac have a 20% chance to be blocked. When a shot is effectively blocked, Host Hat fires 3 projectiles similar to the
Host's.
- Projectiles fired from Host Hat use Isaac's Damage and Range, and copy Isaac's Tear effects.
- The bullets do not use Isaac's Shot Speed.
- Can block:
- Fireballs (e.g. from
Crackle), but their lines of fire harm Isaac. - Fire projectiles (e.g. from
Mega Satan). - Obstacles thrown by
Polty or 
Kineti.
- Fireballs (e.g. from
- Does not block:
- Projectiles fired from Host Hat use Isaac's Damage and Range, and copy Isaac's Tear effects.
- Grants immunity to explosions.
- Grants immunity to bullets falling from above.
Notes
This item has a 1% chance to drop when defeating 
The Gate.- Does not protect against exploding mushrooms.
- Does not protect against
Hush's vertical beams in the final phase. 
Isaac becomes immune to 
Mom and 
Satan's stomp attacks, as they are considered explosions. This makes the item very valuable if trying to unlock 
The Forgotten, as it will protect Isaac from the effects of the 
Broken Shovel.- This item is invaluable in Greedier Mode as nearly all of
Ultra Greedier's attacks are considered explosions. - One of only two items that grant full immunity to explosive damage, the other being
Pyromaniac. - Although Host Hat has firing animation that expose itself after it blocks a tear, it can still block tears in this state, firing bullets as it blocks.
Synergies
Dr. Fetus / 
Epic Fetus / 
Ipecac: Isaac becomes immune to his explosives.
Walnut: Walnut will only require 1-5 explosions to open. As Isaac is immune to explosions, he can safely open Walnut without taking any damage.
Interactions
- The following items that change the property of Isaac's tears affect Host Hat's bullets:
- The following items that modify Isaac's tears do not affect Host Hat's bullets, aside from stat changes (if present):
20/20 / 
Keeper and other multi-shot effects: Do not add Host Hat's bullets.
Anti-Gravity / 
Tractor Beam: Does not affect Host Hat's bullets, aside from stat changes.
Cone Head: Cone Head's chance of blocking effect is applied first. Tears blocked by Cone Head do not cause Host Hat to fire.
- This leaves Isaac 40% chance to negate tears in any way.
Dead Eye: Host Hat's bullets grant the damage multiplier, but do not reset it even when they miss.
Eye of Greed / 
Lead Pencil: Host Hat's bullets are not counted for shots fired.
Gnawed Leaf: Tears can be reflected while Isaac is invulnerable.
Hallowed Ground: Host Hat's chance of blocking effect is applied first.
- This leaves Isaac 60% chance to negate tears in any way.
- Host Hat: Additional copies of this item, such as from
Diplopia / 
Crooked Penny, have no effect. 
Infamy: Infamy's chance of blocking effect is applied first. Tears blocked by Infamy do not cause Host Hat to fire.
- This leaves Isaac 60% chance to negate tears in any way.
Isaac's Heart: Tears can be reflected when hitting the heart, not Isaac.
Holy Card / 
Holy Mantle: Host Hat's chance of blocking projectiles is applied before the shield, allowing it to be saved.
Metal Plate: Host Hat's chace of reflecting effect is applied first. Tears blocked by Host Hat are not reflected by Metal Plate.
- This leaves Isaac 40% chance to negate tears in any way.
In-game Footage
Bones
