Vala's Ethereal Grasp

Target enemy Celestial, targets movement speed is reduced to 0 and is considered grappled. After 1 minute target celestial makes a Con saving throw with the DC being based off the spellcasters spellcasting ability. If succeeds User gains half of targets remaining hp as temporary hp and target loses half of their current hp. if failed, user gains all of targets remaining hp, and target loses their first death save instantly. user gains immortality and any one power of the target.