The Stuff of Summoning

You have excellent timing! Magician Dien asked me to get some materials for Summoning potions. I ran out of Red Toenails, the ones Dien requires. Could you help me, just to stop his nagging? Yank Red Toenails off Gnoll corpses. Give Dien 10 of them. He offers a pretty decent bounty, actually. One last thing. Gnolls are stronger than they look, I don't recommend going alone.