Neptunus
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Neptunus is a passive item added in The Binding of Isaac: Repentance.
Effects
- When Isaac is not firing tears, a charge bar will start to fill up. Holding down the fire button will release all stored tears in rapid succession.
- The charge time and maximum tears per charge scale with Isaac's tears stat, with higher tears charging faster and having more.
Notes
- While at 0 charge, Isaac fires at his normal tear delay, essentially meaning there is no downside.
- Rapidly tapping the fire button will not empty the charge, and can be used as a permanent massive increase to fire rate.
- This item has no observable effect when used as
Tainted Lilith or 
Tainted Forgotten.
Synergies
Camo Undies: The passive charge of Neptunus does not disrupt Camo, and the initial burst of damage is enhanced by Neptunus.
Chocolate Milk: Neptunus' passive charge overrides Chocolate Milk's active charge. Tear damage is determined by how charged Neptunus is.
- Once Neptunus' charge is used up, Isaac will fire uncharged Chocolate Milk tears, resulting in a much lower damage output than without Chocolate Milk.
- Chocolate Milk +
Kidney Stone: Isaac will not fire any tears during the Kidney Stone burst. - Chocolate Milk +
Marked: Isaac will not be able to fire any tears.
- Kidney Stone: Tear bursts stack, firing a very large number of tears in combination with each other.
Interactions
Overrides Neptunus:
-
Azazel/
Brimstone 
C Section
Dr. Fetus
Epic Fetus
The Ludovico Technique
Mom's Knife
Monstro's Lung
Spirit Sword
Technology
Tech X
- However,
Haemolacria + Tech X does work with Neptunus.
- However,
Other interactions:
Cursed Eye: Overridden by Neptunus.
Soy Milk: The charge bar is not present and charged tears are released instantly.
In-game Footage
Trivia
- Neptunus, as well as
Jupiter, was designed for the original Antibirth mod, but never actually implemented until Repentance. - Neptunus' effects and pickup quote reference the Roman god of the sea, Neptune.
Gallery
Concept art.
 Astrological Signs
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 The Binding of Isaac: Rebirth
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