Obsidious

"You have something I require..."

Obsidious is a Hardmode boss that can be fought at night after Plantera has been defeated, with an extremely mobile first phase and a slow but defensive second phase.

Spawn

 * Obsidious can be summoned with the Ulticore anywhere at night.

Behavior
Obsidious moves extremely quickly during Phase 1, flying towards the player and changing attacks as his health decreases. In Phase 2, he becomes a large monster, slowly flying towards the player while occasionally attacking them with his hands. He has four phases which he cycles through on a timer, these phases also getting deadlier as his health decreases.

Phase 1

 * Obsidious holds a fire crystal while flying, which shoots a magma bolt at the player.
 * Every ten seconds, he stops and teleports around the player in a counterclockwise circle ten times, shooting a magma bolt before each teleport.
 * Upon reaching 75% health, Obsidious fires a bararge of green rocks at the player.
 * Upon reaching 50% health, Obsidious constantly surrounds himself with three icicles, which he shoots at the player.
 * Every ten seconds, he remains stationary and two ice crystals spin around him, shooting a beam of ice.
 * Upon reaching 25% health, Obsidious shoots a burst of four homing void balls, teleporting after shooting the first ball.

Phase 2

 * Obsidious cycles through the following attacks:
 * Summons a fire portal, which shoots solar flares at the player. His hands leave a trail of greek fire.
 * Shoots green rocks at the player, which also rise up from the ground.
 * Shoots a burst of eight lasers. His hands shoot two icicles before returning to him.
 * Shoots homing void balls.
 * Below 50% health:
 * Attacks the player with his projectiles more frequently
 * During his first attack, summons a ring of five crystals around the player which shoot fire beams at the player after some time.
 * During his third attack, his hands shoot up to seven icicles.
 * Upon reaching 25% health, Obsidious stops his attack pattern and remains stationary. Every few seconds, he gains a shield making him invulnerable and shoots four spinning lasers around himself.

Tips

 * It is recommended to use homing weapons for Phase 1, since his quick speed combined with his small size make him harder to hit otherwise.

Trivia

 * Obsidious theme is called For The Fallen, which has been composed by Ranipla and GENIH WAT.
 * This theme has a reference to Infernace's old theme, "Embodiment of Hell".

Quotes

 * "You have something I require..." - When summoned
 * "Come on kid, hand it over and I'll spare you the pain" - Upon reaching 50% health
 * "I didn't want to have to do this..." - When his health reaches 0, before he enters Phase 2
 * "I didn't sacrifice my life for nothing, the core will be mine!" - Upon reaching 25% health
 * "No... my crystal is too powerful! I can't die... it's impossible..." - Upon reaching 10% health
 * "Ah, my crystal... crumbling... You still aren't... strong enough for him" - When he dies

Lore
Obsidious was nothing mere but a collector with an obsession with ancient artifacts. Striving through the lands to gather one, he came to realize through rumors that there had to be a mysterious crystal within an ancient, long lost temple in the depths of the underworld. To fill this obsession, he ventured deep down and eventually came to find said temple. Rummaging through the rubble, he found the crystal, covered by a thin layer of obsidian. In a haste, he obtained the crystal and escaped, finding himself immediately attacked by the restless demons of these lands. The collector decided to fight back and seemed to succeed, but such taste of victory did not last, as the demons just kept on coming. Knowing that he might be powerless against them, he tried to flee back to the surface, but failed and after another attack, fell out of balance, with the crystal's obsidian layer crushing off. Knowing he might not survive and in an attempt to spite the demons, he crushed the crystal, so that neither could have it. But it seemed that with crushing the crystal, it had revealed his power. The collector was healed, but had also changed in appearance, taking the one of a gigantic monster build out of obsidian, amalgamating with the crystal as a result. With knowing the tables had turned, the collector - now self proclaimed as "Obsidious", took his revenge and tore down all who dared to attack him. Finally escaping, he travelled across the land, for the crystal had not satisfied him, his hunger for power not stilled. He craved for immense power and just maybe, a core with said power might be enough...