Grognard's Grimoire: Cloak of the Ulfhethnar

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Cloak of the Ulfhethnar: This cloak is made of an intact wolf skin, carefully removed according to a well-guarded occult formula. When worn, the cloak grants the wearer the ability to turn into fearsome half-man, half-wolf creature. In this form, the wearer retains his normal hit points but gains an armor class of 4 (even if this is worse than his ordinary armor class), the ability to bite for 2d4 points of damage, a movement rate of 180' (60'), and an immunity to normal weapons, being harmed only by spells, silver, and enchanted weapons. While in wolf-form, wearers can use normal weapons and cast spells. Wearers of the cloak are not not true lycanthropes and are thus unaffected by wolfsbane. Likewise, they cannot transmit lycanthropy to those they attack, regardless of how much damage they inflict upon them.

The cloak of the ulfhethnar has one additional quality that makes it very attractive to the immoral and degenerate. For each hit point of an intelligent being slain and eaten by the wearer while donning the cloak, he extends the length of his current age stage (see Advanced Edition Companion, p. 23) by one day. There is no limit to this extension, meaning that, with the regular slaughter of intelligent beings, a wearer of the cloak of ulfhethnar can prolong his life indefinitely. There is an additional cost, however. Every time the wearer transforms himself into wolf-form, there is a cumulative 1% chance that his alignment will shift permanently to Chaotic and regard all intelligent beings as little more than potential fodder for his increasingly ravenous appetite. A remove curse spell cast by a Lawful cleric of 9th level or higher can reverse this effect.