Tai's Last Resort

By accepting your own doom, you convert the matter of your body into pure energy. You die, and all creatures in a 60ft sphere centred on your location Must make a dexterity saving throw. A creature takes 3d10 radiant damage on a failed save, or half as much damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 2d20 for each slot level above 1st.