Dead Bird

Dead Bird is a passive item.

Effects

Taking damage summons a bird familiar that chases enemies for the remainder of the current room, dealing 2 damage per tick (~4.3 damage per second).
- As long as Isaac is at a Half Red Heart or less, Dead Bird will remain active for the current floor.

Eve starts with this item by default.
- Additionally, Dead Bird will remain active at one full Red Heart or less.

Birthright + Eve: Dead Bird will be active at all times.
Box of Friends: Does not double Dead Bird, even if Isaac has taken damage before use.
Sacrificial Altar: The familiar can only be sacrificed when it is active.

This item is used in Darkness Falls (challenge #4).
This item is a reference to an old series of comics Edmund McMillen drew called Thicker Than Water, where the Dead Bird is said to represent his inner doubts and self-destructive nature.

Bug!	When using Extension Cord with Dead Bird, if Isaac and the bird are both moving sometimes the electricity does not always fully connect.