Nijuu Yuumu (二重遊夢)/guide

Effects

Wings

Enter the white door in the Nexus. Go north until you see a feather to your right. Interact with the feather to get the effect.

Reaper

Enter the bluish-grey door in the Nexus. Go south until you can't see the bloodstain, then go right until you see the Reaper. Interact with him to get the effect.