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.
Interactions
Brimstone: Overides Neptunus.- Chocolate Milk: Neptunus' passive charge overrides Chocolate Milk's active charge. Tear damage is determined by how charged Neptunus is.
- Cursed Eye : Overridden by Neptunus.
- Dr. Fetus: Overrides Neptunus.
- Epic Fetus : Overrides Neptunus.
- The Ludovico Technique : Overrides Neptunus.
- Mom's Knife: Overrides Neptunus.
- Monstro's Lung: Overrides Neptunus.
- Spirit Sword : Overrides Neptunus.
- Technology : Overrides Neptunus.
- Tech X : Overrides Neptunus.
In-game Footage
Seeds
9LEW RG2W (Planetarium adjacent to spawn)
PC 
LCHN M6M8 (Planetarium adjacent to spawn)
 Astrological Signs
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 The Binding of Isaac: Rebirth
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