Boneclaw, by Ridureyu
Some undead monsters make you question your sanity.
Boneclaws are more than mere undead – these gigantic dessicated corpses are intelligent, and have claws that can extend for up to twenty feet. Moreso, when you reconcile their various pieces of lore in D&D canon… they are natural. A natural mutation, or perhaps evolution of undead creatures. Necromancers have managed to replicate the effect and create their own, but… Boneclaws are a natural occurance. Be terrified.