Incubus

Incubus is an unlockable passive item added in Afterbirth.

Effects

 * Spawns a demonic familiar that fires tears.
 * Incubus' tears are affected by tear modifiers Isaac currently has.

Interactions

 * 20/20: Incubus shoots two tears at once.
 * Analog Stick : Incubus cannot fire in non-cardinal directions, only tears up applies.
 * Azazel: Incubus will shoot a short-ranged Brimstone beam.
 * Brimstone: Incubus will shoot a small beam just like Lil' Brimstone.
 * Anti-Gravity + Brimstone: No effect.
 * Cursed Eye: No effect.
 * A burst of tears is fired, but it does not need to be charged.
 * Dead Eye: The damage multiplier can be raised by Isaac's tears, but not by Incubus' tears. Incubus tears still receive the damage boost. Has no effect on Lilith as she has no normal tears.
 * Dr. Fetus: Incubus fires small bombs.
 * Tech X + Dr. Fetus: Bombs are surrounded by Tech X rings that slowly expand. Fires at normal tear speed.
 * Epic Fetus: Isaac shoots guided missiles while Incubus still shoots normal tears.
 * Evil Eye: Incubus is unable to fire Evil Eye shots.
 * Guillotine: Incubus will fire tears in relative position to its body depending on where Isaac's head is currently.
 * Isaac's Tears: The item is recharged by Isaac's tears, not Incubus'. Lilith can only use it once as she has no normal tears.
 * Loki's Horns: No effect.
 * The Ludovico Technique: Spawns a controllable tear while retaining the ability to fire normal tears. Incubus' tears become piercing and spectral.
 * Marked: Fire rate increased. Incubus fires continuously in the direction the character is facing. When playing as Lilith, the crosshair does not appear.
 * Maw Of The Void: Damage increased. Incubus will not trigger the void ring.
 * Mom's Eye: No effect.
 * Mom's Knife: Incubus gains a smaller knife with much shorter range and quicker charge time.
 * Mongo Baby: Does not copy Incubus's tear effects.
 * Monstro's Lung: The Incubus gains the effect of Monstro's Lung.
 * Number One: Fire rate increased. Range and shot height are unaffected.
 * R U a Wizard?: No effect.
 * Tech.5: No effect.
 * Tech X: Incubus shoots smaller version of Tech X circles, like with its minimal charge. Shots are still charged, but just to shoot a small circle, not to charge larger circles. While charging incubus visually looks like charging brimstone laser.
 * 20/20 + Tech X: Incubus shoots two circles at once.
 * Mom's Knife + Tech X: Tap-shooting laser rings + Mom's Knife
 * A Lump of Coal + Tech X: No effect.
 * Technology 2: Increases fire rate and decreases damage of Incubus' tears. Does not fire a continuous laser.
 * Tractor Beam: Range increased, but trajectory is unaffected.
 * The Wiz: Incubus simultaneously fires two tears diagonally.

Trivia

 * Incubi are evil spirits said to descend upon sleeping people, specifically ones fabled to have sexual intercourse with women during their sleep, or, more simply put, the male version of a succubus.