Pit fighter bits from mordihem range work nicely if your looking for a mechanical look. They come with buzz saws, chainsaws, drills, etc. For a more mutant look i've seen chaos marines with orc choppa arms from the fantasy range, also maybe guant scything talons.
My possessed have necron flayed one claws, as thousand sons cant be mutated i decided to go with a more mechanical look. They could work, but you may want to greenstuff them slightly...or they end up a bit limp-wristed :huh:
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