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Crystal mask of knowledge

(Magic Item Compendium, page 91)

Price (Item Level): 2,500 gp (7th)
Body Slot: Face
Caster Level: 3th
Aura: Faint; (DC 16) divination
Activation:
Weight: ½ lb.

This mask features a piece of curved golden crystal that covers the forehead. The crystal is attached to the front of a dark brown cloth cap.

A crystal mask of knowledge grants you a +5 competence bonus on a specific type of Knowledge check. For instance, one mask would add the bonus on Knowledge (psionics) checks, while another would do so for Knowledge (history).

Prerequisites: Craft Wondrous Item, Knowledge 5 ranks of the appropriate type.
Cost to Create: 1,000 gp (plus 500 gp for base item), 80 XP, 2 days.