Airea

Airea is a hardmode miniboss that has a 15% chance to spawn during a heavy rain. With a 1% chance, oddly it can spawn if you swing your sword lots of times, so beware.

Strategy

 * Swing your sword randomly equipped with shield potions.
 * Use a Magic Mirror or teleportation potion.

Health
It is impossible to beat and is invincible and invisible so screw strategy one except for the shield potion part.

Trivia

 * Airea is based off a pun of the word "Air" and "Area" and also since it takes up the whole area.