Gello

Gello is an activated item added in The Binding of Isaac: Repentance.

Effects

 * Spawns a demon familiar that's attached to Isaac and moves and fires in the direction Isaac shoots, using Isaac's damage, tears, range, shot speed, and special tear effects.
 * Gello's tears deal 0.75x Isaac's damage, or 1.0x if used by.

Trivia

 * Gello is a revenant in Greek mythology who causes infertility, miscarriages, and infant mortality.
 * It is implied to be a fetal.