I am making this guide to help anybody that wants to find the Mask Shards for the Fallen Preyers. Currently, there are 3 of them, each with 3 mask pieces to collect per map.
Will update the guide once there are more.

Location: Island of the Damned

Requierments:

• Gnosis 2
  
• Wailing Tower Puzzle

Level 1, last bridge next to the stairs that lead to the fight



Level 2, next to the statue opposite the portal


Level 4, on the right as you enter, on some boxes

Location: Scarlet Coast

Requierments:

• Scarlet Coast Chart

Location: Irongate Castle

Requierments:

• Irongate Castle Chart

To get up to it, go right through the arches and there will be some boxes stacked that you can climb on, then some suspended boxes

Hope this guide was helpful. If you have any questions or suggestions, let me know.