Found inside Mobar Mine public dungeon. Mobar Mine entrance is well hidden. There are no camps or any other distinct landmarks that point you toward the dungeon. This is one lonely entrance. Upon examining Adainurr at the start of the dungeon for the quest “Sgolag” proceed to the largest dungeon room. Up on a northern part of a wooden platform is where the shard is.
Find the entrance of Mobar Mine.
Mobar Mine entrance map location.
The shard is inside the last cave room.
Sand Kingdom Moons - Super Mario Odyssey Power Moons