Bear Helm

This large helmet is wrapped in the hide of a bear’s head, with metal teeth worked into its visor.

While raging, you can halve the damage dealt by a single sneak attack or critical hit scored against you. You can activate this item after the damage from the attack has been determined.

A bear helm functions once per day.

Prerequisites: Craft Wondrous Item, stoneskin.

Cost to Create: 750 gp, 60 XP, 2 days.

Source: Magic Item Compendium, page 72.