How To Get The Strange Mask To obtain the Strange Mask, you’ll need to reach the end of the mine, where you’ll find another locked door.

The Hollow form Vasto Lorde requires you to collect mask cracks to complete the transformation. How many mask cracks do I need to farm to become Vasto Lorde in Type Soul?

If you want to hit the next stage in Type Soul, you're going to need a lot of Mask Cracks. Here's how to get them.