Castrum Fluminis

A trial against Tsukuyomi, the primal incarnation of the divinity of night and moon, after Yotsuyu transforms using aether-infused crystals.

Tsukuyomi

Phase 1

Mechanic	Type	Description
Torment Unto Death	Tankbuster / Cleave	High damage frontal cone. Tank should face boss away from party and use cooldowns.
Reprimand	Raidwide	Raid-wide AoE damage. Healers prepare.
Steel of the Underworld	Cleave	Large frontal cone AoE. Move to the sides or behind the boss.
Lead of the Underworld	Stack	Stack marker on a player. All players group up to share damage.
Midnight Haze	Adds	Summons two adds that tether and move toward each other. Destroy both before they collide.
Zashiki-asobi	AoE	Fans appear around the arena (one center, six on edges). They explode in sequence starting with center. Stand beside first AoE, then move to center after it explodes.
Nightbloom	Raidwide	Ends Phase 1 with raid-wide damage. Inflicts “Down for the Count” stun.

Notes: Nightfall randomly selects between Steel of the Underworld, Reprimand, Midnight Haze, or Lead of the Underworld.

Phase 2 (Add Phase)

Mechanic	Type	Description
Specters	Adds	Specter of the Matriarch, Patriarch, Asahi, and Zenos spawn. Defeat them quickly.
Suffering Gauge	Enrage	Adds fill Tsukuyomi’s Suffering gauge. Higher gauge = more damage from next Nightbloom.
Zenos Knockback	Knockback	Zenos will knockback and stun players before the phase ends.

Notes: Focus down adds as quickly as possible to minimize the Suffering gauge.

Phase 3

Mechanic	Type	Description
Selenomancy	AoE	Arena splits into white and black sections. Standing in the wrong color causes damage and debuffs.

Notes: Selenomancy appears twice with increased complexity the second time. Watch for visual cues on which side is safe.