Fiend Folio Keeper- can it be broken?

[Cuddly]

The Keeper from the fiend folio is a 4hd/3la outsider with some cool special abilities. One of them is the ability to turn its hands into weapons that act as the weapons they mimic, but count as natural weapons.

Is there a way to break this- say, flurrying with a spiked chain or something?

[Irreverent Fool]

Sure. It says it can form its arms into any melee weapon it has seen. It doesn't say it can't be a magical weapon.

So you just need to show this bugger something vorpal and find some way to give it more arms as well as your suggestion of flurry of blows. Get a feat/spell that gives you a bonus to confirming crits and start chopping heads.