Isaac's bombs become spectral, and will pass through objects.
Isaac's bombs create ghosts when they explode, which rapidly chase and deal contact damage to enemies.
The ghost deals contact damage equal to half of Isaac's damage (2x Isaac's damage per second).
After 10 seconds, the ghost explodes, dealing 7 damage to nearby enemies up to 3 times. Isaac does not take damage from the explosion.
If there are no enemies in the room, the ghost follows Isaac. However, it cannot follow Isaac between rooms.
Dr. Fetus: Spectral bombs are less likely to hit Isaac, but make it harder to blow up specific rocks.
Scatter Bombs: Smaller bombs grant smaller ghosts that seek nearby enemies and explode immediately.
Defeating Delirium as most tainted characters will unlock their gameplay characteristic. Interestingly, Tainted Lost's passive ability to reroll low quality items (Sacred Orb) is unlocked through defeating The Beast instead.
This item may be a reference to "Super Ghost Kamikaze Attack" from Dragon Ball Z.