IIRC when you kill it you should get a selection of limbs to choose from in the rewards menu. The choice of limb doesn't seem to have an effect on your creature. So as long as you chose one. Return to the Necro Ring and talk to complete the quest.
UNKNOWN: Friends help you move...True friends, help you move bodies... E.A.P.: Blood was it's Avatar and it's seal. E.A.P.: Stupidity is a talent for misconceptions.
