Amulet of Unstable Storage
Wondrous item, legendary (requires attunement)
A single spell, up to 8th level, can be stored by casting the spell into the amulet.
As an action, bonus action, or reaction, the stored spell can be cast.
Unstable
Casting a spell from the amulet requires a successful arcana check of DC9+(spell level)+(speed modifier). Casting as an action is a speed modifier of 0, a bonus action is a speed modifier of 2, and casting as a reaction is a speed modifier of 4.
If the check succeeds, the spell is cast as normal. If the check fails, the amulet releases a burst of energy, damaging all creatures within 10 feet. The damage dealt is 2d6*(spell level) damage of the type of the stored spell. If the spell would normally heal the target, it instead deals necrotic damage. The damage dealt to user cannot be reduced by any means. targets within 10 feet can make a DC15 Dex save for half damage. On a natural 1, the amulet does 2d6*(total of all spell levels stored) to all creatures within 10 feet. (The item starts with 1d10+5 spell levels stored. For example, if the amulet had been used to store four 3rd level spells, the damage rolled would be 2d6+12)
Regardless of a success or failure, the spell is expended from the amulet.
Notes: Attunement requires a short rest and the storage of a spell of at least 1st level.
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