The Arkenstone (PROMO)

Unique. +5 to bearer's direct influence against Dwarves and Dwarf factions. Each Dwarf in play has +1 mind. If the bearer of this item is at the same site as a Dwarf character, you may discard this item to force the discard of the Dwarf (and all cards he controls). ...it was tinged with a flickering sparkle of many colours at the syrface, reflected and splintered from the wavering light of his torch.LotRV