Stone Keeper's Shard

Stone Keeper's Shards were a currency added in Patch 3.0.2 and removed in Patch 4.0.1, which converted all remaining charged into Honor Points. Prior to their removal, they were gained through completing weekly quests involving Lake Wintergrasp or by defeating dungeon bosses when your faction controls Wintergrasp. You could find your Stone Keeper's Shards tracked on the Currency tab.

They were used to buy a plethora of different items from or  in Wintergrasp Keep. These NPCs are only accessible when your faction controls the keep. These items are now purchased with Honor Points.

Source
This item was a quest reward from: