Exarch’s Stronghold delve is where you want to go to obtain this shard. It is found in northern Craglorn. Follow the river that flows through central Craglorn to its northern part to enter this part of the map.
Soloable: Yes (need to pass by one group of mobs)
The first and only group you have to dodge/kill is the one at the start of the delve. This group is near the door that takes you to the first long cave bridge. As you go through it and just after couple of steps, look to your right. At the bottom of the cave is the collectible.
Follow the river.
Exarch’s Stronghold Entrance.