Regaroth

Regaroth is a Hardmode boss that is intended to be fought after all three mechanical bosses have been defeated. Defeating Regaroth will remove the Darkened Skies effect from the player. It is particularly important to prepare for this boss, as his fast speed combined with the low gravity of space can catch a player off-guard

Spawn
Regaroth can be summoned using the Swirling Energies in Space at any time.

Behaviour
Regaroth behaves similar to other worm enemies, attempting to ram the player while tunneling through blocks, along with the ability to fly. If taken outside of space, Regaroth enrages, gaining a massive boost to its speed and damage.

Attacks

 * Regaroth shoots a barrage of sky bolts towards the player.
 * Regaroth frequently releases one of two types of energy portals:
 * The first remains stationary after being shot, exploding on impact.
 * The other continues to move in the direction it was shot in, shooting spreads of 7 sky bolts as it travels.
 * Regaroth occasionally summons Thunderlings throughout the fight.
 * Upon reaching 50% of its health, Regaroth will become significantly faster.

Trivia

 * His theme is called "Storm's Battle" and has been composed by Ranipla and GENIH WAT.
 * His old theme was called "Cosmos Awoken", which was composed by Ranipla.

Lore
Lightning is a powerful force of nature, capable of destroying whole biomes, or just bringing them into chaos. Thus it is not much of a surprise that many people fear it. Regaroth, considered a manifestation of lightning capable to cause an electric apocalypse, was a matter of thunder during it's creation far up in the skies, created by the waves of power drawn from an entire army of Sky Elementals, empowered by the will of the elemental god, Abraxis with the intention of creating a being guarding the upper atmospheres of the world. It soon had formed into a feathered serpent, the being now known as Regaroth.

It was only mere unfortune that such things couldn't be held forever - for Abraxis had grown insane with his menacing control over the elements. Since then, the guardian had no master, nor cared about one. Eventually, Abraxis' will started to take a toll on Regaroth's mind, driving it out of control. As a result, it started to obliterate anything living with it's sheer power. These lightnings also activated the mechanical forces, biding in wait deep in the dungeon, way earlier than intended, leading them to roam the surface. While it is considered suicide, the only way to let this madness cease is to destroy it's origin...