"if an instance death spell (finger of death, disngtegret, death spell, with exception of flesh to stone) is casted direct towards the wielder of the sword, the sword will release its soul energy and burst into a devastating explosion. It does 8d8 magic dmg to everyone within 60 ft area, with no save (but it is possible to resis). and everyone getting hit must make a save vs death at -4 or be slain. (including the wielder)"
I dont't think this part is possible.
"a critical hit from this sword will result a feeble mind spell on the target, and the target must make a save vs spell or become a gibering idiot."
Im not sure if It's possible to define between criticle and normal hits. But I haven't tried to make an item this complex before. I will have ago though. I will try the Twisted Equilizer first it looks a little easier.
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