Vibrant Reverie/Aquatix

Aquatix is a Pre-Hardmode Boss, spawned with Watery Egg. It's a large blue Phoenix that resides at Ocean, able to withstand huge amount of damage and revive stronger than before.

Spawn
It can only be spawned with Watery Egg, which can be crafted or rarely dropped by Sharks. It can be only be used at Ocean.

Behavior
Aquatix is a flying enemy, flying over the player. Normally, it shoots 3 water spheres that ricochet 3 times, aimed at the player, before disappearing. It then rams the targeted player for a while and then returns to shoot bombs.

Dealing too much damage in a short time will make it become ethereal, becoming invincible for a short while. It then reappear and can be damaged again. After becoming vulnerable again, Aquatix tries to circle around the player, shooting water spheres that move slowly around, limiting the movement of the player. To prevent this, players must stop deal damage to Aquatix for a while, encouraging short-burst damage. However, you can freely damage Aquatix while it's circling around the player. After a while, it returns normal.

In Expert Mode, Aquatix can withstand more damage before becoming ethereal. This is to compensate the health increase, and increases with more players that join the fight.

Trivia

 * This boss refers to the Aquatrix from the Reborn Mod.
 * Furthermore, the boss was originally named Aquatix from said mod.
 * Ironically, this is the current name of the boss in the mod so far.