Ascension

Target a single creature to ascend, dealing 7d8 psychic
damage. If the creature falls below a quarter of its health
(rounded up) from this attack, it must succeed a DC15
Wisdom saving throw or be ascended (killed). On success, the
creature becomes stunned until your next turn.
At Higher Levels. When you cast this spell using a spell
slot of 5th and higher, the damage increases by 1d8 psychic
damage for every spell slot above 4th.