Infernace

Infernace is a pre-Hardmode boss that can be fought in the Underworld after Skeletron has been defeated. Defeating Infernace will remove Infernace's Wrath from the player and the visual effects present in the world. A lot of preparation is recommended to defeat this boss.

Spawn
Infernace can be spawned with the Fire Core at any time while in The Underworld.

Behaviour
Infernace teleports frequently, changing his behaviour for each attack. He attacks in a pattern, adding more attacks to this pattern as his health decreases. He will spawn multiple different enemies throughout the fight, including his daughter Furosia. Travelling anywhere outside of the underworld will cause the boss to despawn.

Attacks

 * Infernace has the following attack pattern:
 * Infernace chases the player, shooting which pass through blocks.
 * He teleports to the side of the player, flying upwards while releasing bouncing sparks.
 * Upon reaching 75% of his health, Infernace will then teleport above the player, remain stationary and shoot clusters of fire waves.
 * Upon reaching 40% of his health, Infernace teleports to the bottom right of the player and charges diagonally, before teleporting to the other side of the player and doing the same.
 * Upon reaching 50% of his health, he will summon Furosia to attack the player.
 * Upon reaching 11.5% of his health, Infernace becomes invincible and releases a swarm of Hellbats and Lava Slimes. He will become vulnerable once the swarm of enemies has been defeated.

Awakened Mode

 * Infernace attacks more aggressively and shoots more projectiles.
 * Infernace will summon Furosia at 75% of his health and will be immune to damage while she is alive.
 * He will release Hellbats and Lava Slimes at 65% of his health.
 * At 45% of his health he will begin to summon Healing Hearths protected by Rocks, healing him.
 * At 20% of his health he will begin to cause to rise from the ground.

Aftermath

 * Defeating Infernace will remove Infernace's Wrath from the player and the visual effects present in the world.
 * After you defeat him for the first time, the screen vibrates in and out. With these messages appearing in order:
 * "I see."
 * "A new challenger approaches..."
 * "You have a long way to go."
 * After the final message, the screen will stop vibrating.

Sparing
Furosia can be spared if the player kills Infernace while keeping Furosia alive.

Tips

 * Try your best to distance yourself from Infernace, as he deals a lot of contact damage, especially in Expert Mode and Awakened Mode.
 * Having high mobility with accesories like the Bundle of Balloons and especially the ability to dash with the Shield of Cthulhu will drastically help the moving around the arena and in the boss fight in general. As most of its attacks need some flight time to dodge plus combining it with the Shield of Cthulhu is highly recommended to make dodging his attacks and traversing the arena far easier.

Trivia

 * Infernace's theme is "Phoenix Ashes", which was composed by Ranipla and GENIH WAT.
 * Infernace's old theme was "Embodiment of Hell", which was also composed by Ranipla.
 * His lore tells that he used to be a normal demon, until Volcanox's energy turned him into what he is today.

Quotes

 * You arrive, at last. - When summoned
 * Furosia, help me rid of this pest! - Upon reaching 50% / health
 * My daughter... I will be your downfall, monster! - When Furosia is killed
 * I will kill you in my dying breaths! - Upon reaching 11.5% health


 * Upon death
 * Cindari:  Welcome home... 
 * Cindari:  It's been a while. 
 * Cindari:  I'm sorry it had to end this way. 
 * Cindari:  Be safe, Furosia.  (Only if Furosia has been spared)

Lore
A fiery pair of father and child, known as Infernace and Furosia, are two demonic individuals serving under the command of the divine manifestation of the underworld, Volcanox. Ancient times ago, Infernace and his wife, a librarian named Cindari, took part in a war between factions, which resulted in Cindari's death at the hands of Pyroxis, one of Infernace's friends, during a raid. Haunted by such depression, he sought death within the lakes the divinity flared in. In a last-ditch effort, the divinity, known as Volcanox, had liberated his well being and had appointed him to monitor and guard the creatures that lived peacefully within the underworld, imbuing the demon with a fraction of the divinity's very own power.

All Cindari left behind was the remnant of her spirit, lingering in the library in which she died, and a child named Furosia, which Volcanox had also appointed as a protector of the demonic civilizations living within the depths. Infernace and Furosia would soon aid each other when a buried volcano erupted that took the lives of thousands of creatures and forced thousands more to adapt. It wiped out most of the civilizations, leaving the few survivors mentally broken and hostile to anything that approached them.

Mere weeks afterwards, a dark-hearted void serpent laid waste to the underworld, finally destroying the remnants of the inhabitants. The father and the child helped Volcanox with all they had, though the two were severely injured and had to rest for many months to recover. In the aftermath, many species went extinct while the serpent had battled Volcanox, the ones which survived had been badly scarred, or taken in by the void and turned against their guardians. Severely dimished, though still powerful, Infernace and Furosia continue their duty of guarding the underworld to this day; slaying whatever may invade.