My Totem Will Eat Your Corpse.. :)

Oops, sorry guys, that's not supposed to be there.
It's disabled from dropping, but found it's way into the quest rewards by mistake.

The skill is not ready, and will be disabled soon, as we don't want skills in beta which aren't working yet.

Its currently an experimental skill (we make a lot of those, they don't all work out) which may or may not eventually be fleshed out into an actual skill and added to beta (in which case the existing gem should work again with the finished skill), or might not (in which case that gem will be very, very rare and maybe of trade value to collectors, I guess).
So we can't promise yet that'll actually be a skill that ends up in the final game. Apologies for the mistake.