Serpent's Kiss

Serpent's Kiss is an unlockable passive item added in The Binding of Isaac: Afterbirth.

Effects

 * Grants a chance to fire poison tears, each tick dealing damage equal to Isaac's.
 * Poison from the shots will tick 2 times.
 * Inflicts poison on enemies who make contact with Isaac.
 * Contact poison will tick 6 times.
 * Enemies who are killed after they have been inflicted with this type of poison have a 20% chance to drop black hearts.
 * Enemies who are killed by contact poison have a 20% chance to drop black hearts.

Synergies

 * / : Bombs and missiles may become poisonous, and enemies hit by them may drop black hearts.
 * Invulnerability: Contact while invincible poisons enemies.
 * Enemies poisoned by the knife may drop black hearts.
 * Dashing into enemies will often both kill enemies, and cause them to drop black hearts.

Interactions

 * The Godhead aura cannot inflict poison but the tears themselves may poison enemies on contact.
 * The following interactions are trivial in Repentance:
 * / : The black rings may poison enemies but do not generate black hearts.
 * The blood barrage may poison enemies but does not generate black hearts.
 * / /  / : The lasers may poison enemies but do not generate black hearts.
 * May poison enemies but does not generate black hearts.

Trivia

 * Serpent's Kiss is most likely referencing Viper (Madame Hydra) from Marvel Comics, who has green lipstick and has transmitted poison through hollow fangs or poisoned lipstick before.

Seeds
NFMD MEVX (Treasure Room adjacent to spawn) E14Y Q0Z7 (Treasure Room adjacent to spawn) QZC2 FNKQ (Treasure Room adjacent to spawn) 7BXL YJFT (Treasure Room two down from spawn then one to the left) R77P MR8A (Treasure Room adjacent to spawn)