A sphere of negative energy ripples out in a 60-foot-radius sphere from a point you can see within range.

Each creature in that area takes 8d8 necrotic damage. Any creature (not an undead or a construct) reduced to 20 or fewer hit points by this damage must succeed on a Constitution saving throw or be instantly killed.

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the hit point threshold for creatures to make the Constitution saving throw increases by 10 for each slot level above 6th (for a total of 50 when cast at 9th level).