Amius the Lunar Archon: how his two forms work and how to beat him

Amius the Lunar Archon is the final boss of the Cursed City of Sintranos. You reach him by collecting three Eclipse Keys from Double Boss stages across the four districts. There are 12 possible stages where a key can appear. Once you have all three, you face a boss who swaps between two forms with very different skills.

The two forms

In Base Form, Amius leans on healing and buff manipulation. Waxing Potence hits everyone for 10% more damage for each buff on him, and heals him for 100% of the damage dealt, including damage absorbed by Shields. Lunar Storm heals him for 20% of his MAX HP, with an extra 5% for each buff extended. Rampant Chaos turns debuffs on him into their mirrored buffs for 3 turns, then Stuns every non Mythical Champion for 1 turn.

In Alternate Form, he turns dangerous. Abyssal Construct hits one enemy twice, ignores 100% of DEF and deals 20% more damage for each debuff on the target. It goes for the Champion with the lowest HP. Maniacal Bedlam converts your buffs into mirrored debuffs and applies an irresistible, unblockable Sleep for 1 turn. While he is under Eclipse, he also ignores Shield, Block Damage and Unkillable buffs and cuts the healing your team receives by 50%.

The Eclipse trap

Eclipse lasts 3 turns and cannot be removed, blocked or manipulated. If you kill Amius in his Alternate Form while Eclipse is active, he revives with 30% HP and 50% Turn Meter. Aim to finish him in Base Form, bring a well timed Block Revive, or save your big damage for after he switches back.

Cooldown reduction is a hidden risk. Every time an ally's cooldown is reduced by a skill, Artifact, Accessory or Mastery, Archon's Ascendance drops by 1 turn, so he transforms sooner. In Alternate Form, the same reduction triggers an extra Abyssal Construct on a random Champion.

What to bring

• Heal Reduction, ideally at 100% before he heals, to stop Base Form undoing your damage.
• Block Debuffs to stop the Rampant Chaos Stun wrecking your rotations.
• Buff removal for the buffs he gains from converting your debuffs.
• Decrease ATK, active before he transforms, to soften Alternate Form damage.
• A dedicated tank for Abyssal Construct. A high Awakening Level reduces its Ignore DEF effect.
• Cleansing, healing and Revive, since Shields alone will not hold in Alternate Form.

He is immune to most crowd control, and also to Decrease SPD and Turn Meter reduction, so do not plan around controlling his turns. Enemy MAX HP damage is capped at 5% of his MAX HP in Base Form and 10% in Alternate Form.

Steering his skill choice

When Eclipse expires, the debuffs on him decide what he does next. With two or more debuffs that have mirrored equivalents, such as Decrease ATK and Weaken, he prioritises Rampant Chaos, so have Block Debuffs ready. With too few, he uses Lunar Storm instead, which is bad news if your Heal Reduction has run out.

An example Hard mode team

The team in the source guide is Elva, Michelangelo, Leminisi, Adelyn and Minaya. Elva brings a single target revive, Remove Debuffs, Increase SPD and Block Debuffs. Michelangelo brings Decrease ATK, Leech and a Taunt, plus an Evade passive that helps him survive Abyssal Construct. Leminisi strips buffs and applies Heal Reduction. Adelyn's high Awakening Level makes her a good Brimstone carrier, and she adds Decrease ATK. Minaya adds healing, Block Debuffs, Shields, Heal Reduction and Leech.

Treat that as a template for roles rather than a requirement, and fill each one from what you own.