Spawns a familiar projecting a circular aura that slows enemies and enemy shots within its radius and for some time once they exit.
The aura does not affect bosses but slows down their shots.
Bosses that use tight volleys of projectiles are extremely difficult to avoid without additional items to block, remove, or redirect those shots, as the slowing effect will cause their attacks to clump together.
2Spooky/Venus: The slowing aura mitigates the delay between fast enemies that charge Isaac and the status effect, making it much harder for Isaac to take contact damage.
Bot Fly/Psy Fly: The slowing aura allows these items to deal with the incoming projectiles more reliably.
The Soul: The slowing aura allows incoming enemies and shots to be more reliably deflected.
BFFS!: The aura does not slow things from further away despite increased visual size.