Necklace of Bloodlust

You wonder what crude brute would wear a bloodstained necklace made of human and animal teeth, plus something that appears to be a ripped piece of spine.

A blood-stained necklace
Cursed, 33% chance of recursing itself on equip
+2 STR
-2 INT
+30 MR
Forces Berserk
+5 Damage
-20 Stealth

Not terribly useful, even for a berserker: an amulet that recurses itself, reduces intelligence, causes berserkitis, and reduces stealth is simply not worth it. The only exceptions might be undead and Ashenzari worshipers: those for whom the berserk will not be a problem. Even then, the only real benefit is the +5 slaying, which is nice but often obtainable through less painful means.