"The darkness from within a reaper's pearl has spilled into you, enabling you to take on its shifting, amorphous, shadow-form."
Dark Phase is a spell that can only be learned after defeating the Reaper by consuming the Reaper Pearl.
Makes the caster Invisible and Ethereal as well as transforming the caster into a dark, cloudy mass that can move through the air freely and even pass through walls albeit at a slower speed. After 4 seconds, the caster will resume their previous form. If this happens while inside a wall, the caster will be returned to the open space where they entered the wall before becoming tangible again.
Neither this nor the other Reaper spell, Orbis Malus, have a Trance, Overload, or Unstable variant.
