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If it is a weapon, make it absorb the souls of the people he killed. After doing so, they can speak into his mind while he is carrying the sword. Initially giving him disadvantage to Nerf Buff Patch Adapt purple shirt saving throws, then when the voice of the developing voice began to reduce the number of good breaks in the long run. Finally add fatigue points, damage to wisdom, and if they never let it go crazy.
caphematcha96 