Astral Layers are mental items that feed into Razputin's astral projection in mental worlds. They can transport Raz back to the last checkpoint should his Mental Health be fully depleted. Collecting one of them restores one layer of Razputin's projection depth. If all layers should be depleted, Raz will be kicked out of the mind he's currently in and sent back to the Real World. If he is already in the real world and he runs out of projection layers, despite being in the real world he gets sent back into it but to a different location in the real world.