The Ancients

The Ancients are a group of post-Moon Lord bosses that can be fought after Azana has been defeated. The fight consist of the 4 Ancients - Krecheus, Kirvein, Xernon, and Izaris, - simutaneously attacking the player, before revealing their true form upon defeat. They are the current final bosses of the mod.

Summoning
The Ancients do not spawn on their own and are summoned by speaking to the Storyteller after Azana has been defeated, who now has the "Question" option replacing "Story". Selecting it and then the "Fight" option transforms the Storyteller into the four Ancients, initiating the fight. While any of the Ancients are alive, the screen is tinted a light green.

The Ancients can be repeatedly summoned this way until they are defeated. Afterwards, the Storyteller will no longer respawn. In order to spawn The Ancients again, the player can use a Resurrection Sigil in any biome at any time.

Krecheus
After spawning, Krecheus is surrounded by a ring of 6 invulnerable blades for the rest of the fight, which damage the player on contact. For most of the fight, he charges directly at the player, though every 15 seconds he performs a stronger attack. Upon death, he leaves behind an orange crystal shard that floats above the player.
 * Charges directly at the player, stopping at short intervals before charging again.
 * Every 15 seconds, randomly selects one of four attacks:
 * Aligns with the player horizontally before performing an extended charge for 2 seconds.
 * Aligns himself above or below the player then moves down or up respectively, firing a slanted wall of 12 horizontal blades.
 * For 3 seconds, stops and randomly summons blades which travel horizontally from one edge of the player's screen to the other.
 * Slowly circles around the player's current position, surrounding it with a trail of fire. This trail damages the player on contact and lingers for 7 seconds.

Kirvein
Kirvein attempts to horizontally align with the player from a set distance, only switching sides if they moves pass him. For most of the fight, he slowly fires arrows at the player, though every 10 seconds he performs a stronger attack. Upon death, he leaves behind a green crystal shard that floats above the player.
 * Fires a green arrow at the player every 1.5 seconds. This timer decreases as his health does.
 * Below 30% health, fires a burst of four arrows every 2 seconds instead.
 * Every 10 seconds, randomly selects one of the following attacks:
 * Fires a super-charged arrow, which is faster and leaves a trail of explosions.
 * Fires a crystal into the air, which splits into six crystal fragments after 1 second. After half a second, the fragments home in extremely quickly before exploding.
 * Below 30% health, the timer is decreased to 5 seconds.

Xernon
Xernon attempts to vertically align with the player from a set distance, only switching sides if they move pass him. For most of the fight, he slowly fires water bolts at the player, though every 30 seconds he performs a stronger attack. Upon death, he leaves behind a blue crystal shard that floats above the player.
 * Shoots a water bolt at the player every 2 seconds.
 * Below 60% health, water bolts explode upon contact with the player.
 * Below 30% health, explosions release a ring of 7 crystals.
 * Every 30 seconds, randomly selects one of the following attacks:
 * Moves to the top right of the player then slowly charges horizontally, releasing a slanted wall of 9 water bolts. Then moves to the player's bottom left and repeats.
 * Moves above the player and releases 2 homing water bolts, which disappear after 3 seconds or on contact with the player.

Izaris
Izaris flies back and forth at a set distance above the player. He does not attack the player directly, instead releasing minions periodically. Upon death, he leaves behind a purple crystal shard that floats above the player.
 * Summons a Crystal Serpent which attempts to ram the player. If 4 Crystal Serpents are present, Izaris stops summoning them.
 * Summons 4 Energy Seekers, which hover around the player while occasionally charging at them. If 8 Energy Seekers are present, Izaris stops summoning them.

Upon defeating all four of them, after a short pause the crystals combine to form the Ancient Amalgamate.

Final Phase
The Ancient Amalgamate has 11 different attacks to choose from at different stages of health, sometimes using more than one attack at once


 * He flies around and swings his hands at the player, similar to Skeletron, but faster.
 * He spins his hands around, creating a crystal shield which reflects all projectiles.
 * Teleports to the sides of the player and charges at them.
 * Occasionally, he will disappear shortly and creates projections of the ancients which deal contact damage, move up and down, left and right.

Above 50% health:
 * Moves around and creates crystal clusters which that appear around the player.
 * Shoots down homing projectiles from above.
 * Shoots out circles of crystalline kunais.

Above 25% health:
 * Creates a galaxy of kunais.

Under 50% health:
 * Occasionally shoots exploding projectiles.
 * Teleports around the player and shoots at them.

Under 25% health:
 * Shoots both exploding projectiles and cluster attack.
 * Creates a flower pattern of crystalline kunais.

Aftermath

 * After the Ancient Amalgamate has been killed, A Shock wave will send the player back a few blocks, shortly after the shock wave has passed you, up to and some Super Healing Potions will appear. Shortly after, you will be sent into a credit scene.

Trivia

 * The theme of the first phase is called "Forgotten Resurrection" and was composed by Universe.
 * The second phase currently shares the same theme.
 * If the player turns on Autopause when the fight starts, the Ancients will display a unique quote: "Using autopause huh? What a wimp".

Lore
Many millenia ago, when Terraria was anew, a curious energy anomaly had borne the Ancients deep underground from elemental crystals through an unholy ritual. Their very beings threatened Terraria when they emerged from the earth, as although they had terrifying combined power already, they suffered an insatiable appetite for power. During their odyssey for power, they confronted an omnipotent primordial being known only as Abraxis, who granted them incomprehensible power, but warned them of using the power against Terraria or there would be most severe consequences. A deal the Ancients could not resist.

The Ancients devised a plan out of Abraxis' sight to destroy Terraria, and unearthed a forbidden ritual that produced a hungering infection that sought to obliterate the universe and all of its life itself, planting the infection into a poor unsuspecting soul. When Abraxis found out not too long later, he was furious, robbing them of their vitality and sealing it away for eternity, its physical form only to come into fruition should several incomprehensibly powerful sources intersect.

The Ancients were left only as mere wisps of consciousness lost among an abyss, and so the wisest of the Ancients, Izaris, formulated a tactical plan. The Ancients crept from their hiding spot and, to avoid the wrath of Abraxis that would inevitably be the fall of them, warped together into the form of a meekly old Terrarian—the Storyteller—and they waited many moons until the young hero arrived. They then used the hero as a tool to slay the great primordial beasts of Terraria, alloting the Ancients each enough combined power to return to their physical forms, and additionally erasing much of the forces they failed to apprehend—and plenty more to eradicate the hero and seal the dark fate of Terraria forever, leaving them as the unquestionable gods of not only Terraria, but the universe itself, for eons until the stars died out and the universe came to a peaceful halt.