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Me to my players tonight, they deserve it
(ttrpg.network)
For context, they managed to successfully accomplish an impossible task (defeating a Lich with it's minions) to save their tribe's armoury and magical item stash. So their master, an Ancient Red Dragon, will give them an item from his own collection
Hmmmm. This would be a weird addition to the game. Since they are monsters themselves XD
Yeah, you'd definitely want to keep a sword like that happy, since it might decide to disintegrate you. Plenty of other options for its goal (who it wants to stab) that might be more interesting narratively.
I was just describing one the most OP swords possible in the original DMG — and when just about everyone is a "non-human monster" that's the power option.