Conjure Dragon Spirit Swarm

You call forth gamboling spirits of playful baby dragons, the spirts appear at any point you can see within range and take up a 10ft sq, the spirits can occupy another creatures space. Any creature that moves into or starts it's turn in the area must make a constitution saving throw or take 3d8 mixed damage, taking half on a failed save. This damage counts as magical and ignores all resistances. The area also counts as difficult terrain

As a Bonus Action you can move the swarm up to 30ft.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 per level