Death Cross

In an unoccupied space within range, a small cross of light appears and grows brighter every second. At the beginning of your next turn the cross bursts with light that extends in a 15 ft. straight line into all four cardinal directions.

All creatures hit by the light must make a Constitution Saving throw, on a fail they take 3d8 Radiant Damage and half as much on a successful one.

The damage increases by 1d8 per Spell level and you can't cast this spell two turns in a row.