This horned, black adamantine helm seems to absorb the light around it. The helm’s faceplate shows a fiendish visage, and hellish orange light leaks from its eyes, nostrils, and mouth.

A fiendhelm allows an evil-aligned wearer to emulate certain traits of evil extraplanar creatures. Your melee attacks are treated as evil-aligned for the purpose of overcoming damage reduction. This is a continuous effect and requires no activation.
In addition, a fiendhelm allows you to use dispel good, inflict critical wounds, and resist energy (electricity or fire only) as spell-like abilities each once per day. Use your own character level as the caster level, and the save DCs equal 10 + the spell level + your Cha modifier.
A fiendhelm grants no benefit to non-evil wearers.

Prerequisites: Craft Wondrous Item, dispel good, inflict critical wounds, resist energy, evil alignment.
Cost to Create: 5,000 gp, 400 XP, 10 days.