Summon Celestial 5th level Conjuration Is Summon Celestial Good? Overall Rating: Sky Blue. This means that summon celestial is an amazing spell. If you do not take this spell your character would not be optimized. Overall Notes: One of the best summon spells from Tasha’s Cauldron of Everything. The celestial you summon has flight, ranged and melee attacks, radiant damage, and healing abilities.