Dreadful Fog

You summon a thick, low-lying fog in a 15 ft radius sphere centered on a point you can see within range. The area is lightly obscured. When a living creature enters the fog for the first time on a turn or starts its turn there, it must succeed on a constitution save against the caster's save DC. or have its speed reduced by 10 ft. until the start of its next turn. While inside the fog, creatures have disadvantage on their first attack roll each turn.

This spell has no effect on the undead.

For each spell slot above 2nd, this spell gains a 1d4 of necrotic damage.