It appears to be a horde of skeletons with green eyes wearing a purple mage suit. Each mage is holding a staff.
The skeleton mages shoot magic projectiles at the enemies.
- They are slow so they take time to approach.
- However, they do not need to approach, since they can shoot magic projectiles at you. You should dodge these projectiles. Moreover, they are slow enough to easily dodge them, so take that as an advantage too.
- They have slightly low health, so a Sniper weapon can be used to kill them.