Go inside The Grotto of Depravity solo dungeon. Enemies inside are level 45 Seducers and they come in groups of two. Collectible is inside the room with the largest pond, northwestern Grotto of Depravity. There are many enemies here. Shard is at the bottom of a large tree, near an edge of the pond, across the small wooden bridge.
Find and enter The Grotto of Depravity solo dungeon.
Dungeon entrance map location.
Sand Kingdom Moons - Super Mario Odyssey Power Moons