Neptunus

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.

While at 0 charge, Isaac fires at his normal tear delay, essentially meaning there is no downside.
Rapid 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) Tainted Lilith or (Tainted Forgotten) Tainted Forgotten.

Brimstone: Overrides Neptunus.
Chocolate Milk: Neptunus' passive charge overrides Chocolate Milk's active charge. Tear damage is determined by how charged Neptunus is.
C Section: Overrides Neptunus.
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.
- However, Haemolacria + Tech X does work with Neptunus.
Soy Milk : The charge bar is not present and charged tears are released instantly.