Polarities Mod/Orthoconic

The Orthoconic is a Hardmode enemy that begins spawning in the after Golem is defeated and the player has accrued over 12 minutes of. It pursues the player relentlessly, even able to fly through the air and pass through tiles, alternating randomly between several different attacks:
 * It jets away from the player a short distance, shooting a spread of projectiles from its backside that curve on parabolic trajectories in the general direction of the player.
 * Fires a stream of energy bolts from its shell that curve in elliptical arcs, covering a large area in front of it. This attack cannot be repeated twice in a row.
 * Swims in two tight circles before charging directly at the player, swimming in one more loop after the charge ends. This attack cannot be repeated twice in a row.
 * Swims a short distance towards the player before flipping around twice, attempting to hit them with its shell then returning to its original position.