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+1 rending attack. All close combat attacks of a creature with rending claws also become rending, except in the case of Bioplasma.
Seriously, though, I wouldn't put Scything Talons on Genestealers if I were you. They aren't worth it because you'll be getting less models for more points. The only Genestealers I would consider putting Scything Talons on are a Broodlord retinue because those extra attacks can be useful if you infiltrate the BL/Retinue and use them as kind of a strike force.