Guide:
Northwestern central Coldharbour, north of Forsaken Village (area of interest POI), east of Shrouded Plains Wayshrine.
Go inside Aba-Loria solo dungeon to pick up this shard. Entrance to this dungeon is at the end of the northernmost main road in western Coldharbour. It looks like an Ayleid Ruins area. Enemies inside are level 45 Salaches that come in groups of three.
Collectible is inside a corner of a small room in western dungeon room, next to two small bookshelves.