This rough blue-purple gemstone has a small mechanical device affixed around its center. Once per day, you may cast banishment (DC 13) through the stone without expending a spell slot. If you have spell slots that are of a high enough level to cast the spell, you may cast this spell using your own spell slots.
If this item is used on a willing Warlock, they make their saving throw with disadvantage. On a failure, they must roll a d100. If the result is lower than their highest spellcasting level, they fall dead. If the result is higher, their pact is broken. The warlock still retains their known spells and invocations, but loses all spell slots, class features, and is no longer considered a warlock for attunement purposes. You regain all your warlock spell slots and features when you acquire new spell slots, whether through multiclassing or finding a new patron, but you are no longer bound to your patron.
After banishing 20 CR worth of enemies, this item evolves, becoming the Banishing Gatestone MK-1.
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