Trollblood Ioun Stone

Given by Tsolak's messager in Troll Claw Woods Flaming Fist Encampment if you dispatched Isabella and Ikros for him.

In-game description
"This ioun stone gleams dark green, like a hardened globe of troll blood. Legend tells of its creation from the blood of seven different trolls, each one captured and then subjected to magical experiments for seven nights. The resulting ioun stone both grants its user a weaker form a troll's healing ability and increases their martial prowess against trolls."