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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| Items |
 The Binding of Isaac: Rebirth
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