Demonhair Shirt

This filthy black garment is woven from hoarse black hair. The knots and flecks of unspeakable grime make wearing, let alone, handling the shirt unpleasant. When wearing a demonhair shirt you gain immunity to fear. If you have the rage class feature (or a similar ability), you may spend two of your daily uses of rage at once to become overcome with demonic fury, gaining a +6 profane bonus to Strength, +2 profane bonus to Armor Class, and a +10 profane bonus to speed. While under the effects of demonic fury, your natural weapons and weapons you wield count as chaotic for the purposes of overcoming damage reduction. In exchange for these benefits, you take 2 points of nonlethal damage each round. Once activated, the demonic fury lasts for a number of rounds equal to your improved Constitution bonus (minimum 1 round). This benefit stacks with rage (and frenzy). At the end of this time, you become fatigued for 1 hour.
Good characters take no penalty for wearing this shirt unless they abide by a code of conduct. Wearing this item violates codes of conduct for both good and lawful characters.
strong; (DC 21) conjuration and enchantment, CL 13th; Craft Wondrous Item, rage, summon monster IV, caster must have 16 ranks in Craft (weaving), caster must not be good. 13,000 gp, 1,040 XP. Weight: 3 lb. Market Price: 26,000 gp.
Source: Dragon #356