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Satanic Ritual (Booster Pack #5)

EDIT: This item is now in booster pack 5! The name has changed to 'Sacrificial Altar'.

Sacrifice your familiars to satan for devil items!

This one time use item sacrifices 2 random familiars in the room, and gives you a random devil item for each familiar. It also sacrifice every blue fly/spider in the room and gives you a penny for each one.

It can only sacrifice things that make sense to sacrifice, so can't sacrifice things like The Relic, Bomb Bag, Holy Water, 1up!, Mom's Razor, etc.

You can trick satan and sacrifice to him familiars you got from Monster Manual or Box of Friends. Or even things like Eve's Bird Foot once it's triggered.

If you sacrifice Guardian Angel, Sworn Protector, or Seraphim, satan is extra pleased and reward you with a bonus of 2 black hearts.

If you're playing with Lilith it wont sacrifice Incubus.

Found in the Devil Room & Curse Room. Cost 2 hearts.

Some of the items from the devil pool are omitted because they are not "dark" enough, or because of balance.
Here are the 35 items that are possible to get when you sacrifice a familiar (2 actives and 33 passives):

Book of Belial
Void
7 Seals
Athame
Betrayal
Black Powder
Cambion Conception
Ceremonial Robes
Contract From Below
Dark Bum
Dark Matter
Demon Baby
Empty Vessel
Gimpy
Goat Head
Lil Delirium
The Mark
My Shadow
Pentagram
Sacrificial Dagger
Shade
Succubus
♥♥♥♥♥ of Babylon
Abaddon
Brimstone
Dark Prince's Crown
Death's Touch
Eye of Belial
Incubus
Judas' Shadow
Lord of the Pit
Maw of the Void
Mom's Knife
The Pact
Spirit of the Night

Code & Idea by Niro
Art by PJJLegend