"A hunched-back ancient wrapped in a black robe. His smile is warm. Protruding from his back is a stalk hidden under a veil. The stalk forks into two hands with eyes in their palms, and immediately you know why men follow Irudad."
Elder Irudad is the leader of Joppa and shares some history about Joppa and Qud. He and Mehmet will teach you Harvestry if your faction value with Villagers of Joppa is high enough. In addition, he'll be the person you'll talk to when finishing the What's Eating The Watervine? quest.
If defeated, he tends to drop a single medium-high level item and gives 1000 XP.
He is also the easiest creature to kill who has a max value +3 ego face, so it can be worthwhile to keep using dismember on him until you acquire it, just be careful not to be seen wearing it in Joppa if you don't want Mehmet to become hostile.