Blood Bombs

Blood Bombs is a passive item added in The Binding of Isaac: Repentance.

Effects

 * Gives Isaac a heart container and heals him for five hearts.
 * Causes Isaac's bombs to leave a pool of red creep on the ground when they explode.
 * The creep deals 2 damage per tick (20 per second) and lasts ~15 seconds.
 * If Isaac has no bombs, allows him to place a bomb at the cost of taking half a heart of damage. This prioritizes red hearts over soul hearts.

Trivia

 * This is the only bomb-augmenting item that does not give any bombs on pickup.
 * The fact that the item gives a heart container and healing instead of bombs may be a hint for the mechanic of using health for bombs, as well as a substitute for actual bombs.
 * The fact that the item gives a heart container and heals up to exactly 5 containers, along with the appearance, makes it very similar to.
 * A Blood Donation Machine will be shown as a cause of death on Isaac's last will if he dies as a result of placing a bomb and losing all health.