Arcane Swarm

A Arcane Swarm is summoned at a range of 120 ft in a 15 ft area of swarming missiles.Were the player cast the swarm it does 1d4+ casters Int mod a Dex save for half damage.The swarm stays in that area for 5 rounds and in that area any creature that enter that space will take half damage of the spell no saves after the spell has been cast.Arcane swarm can't be cast again until the first swarm is finished.