Call of the Necropolis

You call forth the power of the Necropolis to bring forth a number of undead creatures to serve you. You can summon up to six undead creatures, such as zombies or skeletons, that appear within range and obey your commands. The summoned creatures remain until the spell ends, or until they are destroyed or dismissed by you.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, you can summon an additional undead creature for each slot level above 5th.