Arcane Spirit

An arcane spirit, enveloped in the chosen element, appears and hovers for the duration in an unoccupied space of your choice that you can see within range. The spirit occupies that space and is indistinct except for a swarm of arcane energy based on the element of summoning.

Any creature hostile to you that moves to a space within 10 feet of the spirit for the first time must succeed on a Dexterity saving throw. The creature takes 2d20 elemental damage on a failed save, or half as much damage on a successful one. The guardian vanishes when it has dealt a total of 180 damage.

When the summoning is cast at higher levels you may add an additional die (lvl 4 = 3d20, etc..)