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 behavior for each attack. He has a set attack pattern, teleporting frequently adding more attacks to this pattern as his health decreases. He spawns multiple different enemies throughout the fight, including his daughter Furosia. Travelling anywhere outside the Underworld will cause the boss to despawn.

Attacks

 * Infernace has the following attack pattern:
 * Chases the player, shooting which pass through blocks.
 * Teleports to the right of the player, flying upwards while releasing bouncing sparks before repeating on the player's left.
 * Upon reaching 75% health, Infernace teleports above the player, remains stationary and shoots clusters of slow fire waves.
 * Upon reaching 40% health, Infernace teleports and charges diagonally from below the player twice.
 * Upon reaching 50% health, summons Furosia to attack the player. Furosia charges at the player 3 times, then teleports and rapidly shoots 2 Infernal Spikes horizontally, repeating the pattern afterwards.
 * Upon reaching 11.5% health, becomes invincible and releases a swarm of Hellbats and Lava Slimes. Infernace will become vulnerable once the swarm of enemies has been defeated.

Awakened Mode

 * Attacks more aggressively, shoots more projectiles, and spawns more enemies when he becomes invincible.
 * Summons Furosia upon reaching 75% health instead.
 * Spawns an additional swarm of Hellbats and Lava Slimes at 65% of his health.
 * Upon reaching 45% health, summons a Healing Hearth, which rapidly heals Infernace and is protected by Rocks.
 * Upon reaching 20% health, every 6 seconds a harmless ring of fire appears on the nearest blocks below the player's current position. After a 3 second delay, an rises from the ring.

Aftermath

 * Infernace leaves behind his loot in a midair frame of Hellstone Bricks, similar to the Wall of Flesh.
 * When Infernace is first defeated, before dying he becomes invincible. Two fiery souls - his fallen wife Cindari and the defeated Furosia - appear next to Infernace, welcoming him and expressing their sorrow that he had to die this way. Then they all disappear, with Infernace leaving behind his loot.
 * Infernace's Wrath and its accompanying visual effects are removed from the player.
 * After you defeat Infernace for the first time, the player runs into their first Encounter. The screen is tinted purple, vibrates, and the following messages appear above the player:
 * "I see it now."
 * "A new challenger approaches..."
 * "You have a long way to go."
 * The encounter ends after the final message and the screen returns to normal.

Sparing
To spare Furosia, she must not be killed during the player's first successful fight. If this is done, she disappears after Infernace is defeated and does not appear as a soul during his death animation.

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 states 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)


 * When first defeated
 * Cindari:  Welcome home... 
 * Cindari:  It's been a while. 
 * Cindari:  I'm sorry it had to end this way. 
 * Cindari:  Be safe, Furosia.  (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.