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Linked

(Magic Item Compendium, page 12)

Price (Item Level): 6,000 gp (10th)
Body Slot: Armor or shield
Caster Level: 7th
Aura: Moderate; (DC 18) divination
Activation: Standard (mental)
Weight:

You sense this item’s inner power more with your mind than your sight.

When you activate a suit of armor or a shield that has this property, you can form a telepathic bond with any or all known wearers of other linked items within 10 miles. Wearers can communicate telepathically through the bond even if they do not share a language. No special effect or influence is established as a result of the bond.
The linked property functions three times per day, and the effect lasts for 1 hour.

Prerequisites: Craft Magic Arms and Armor, Rary’s telepathic bond or mindlink (EPH 120)
Cost to Create: 3,000 gp, 240 XP, 6 days.