Castrum Marinum

The second trial of the Sorrow of Werlyt questline, featuring the Emerald Weapon—a Garlean warmachina with devastating blade and laser attacks.

Emerald Weapon

Phase 1

Mechanic	Type	Description
Emerald Shot	Tankbuster	Multi-hit tankbuster that opens the fight. Use mitigation for consecutive hits.
Optimized Ultima	Raidwide	Unavoidable raid-wide damage. Healers prepare group healing.
Emerald Beam	AoE	Boss spins clockwise with front/rear cone AoEs while pulsing circle AoEs expand outward. Zigzag while running clockwise to avoid both mechanics simultaneously.
Magitek Magnetism	AoE	Two mines appear with positive (+) or negative (-) charges. Same charges repel; opposite charges attract. Position based on anticipated mine movement before detonation.
Sidescathe	Cleave	Hits half the arena. Dodge by standing on the side without the glowing wing.
Split	Knockback	Boss sheds legs with pushback effect. Position carefully to avoid falling off arena edges.
Divide Et Impera	Tankbuster / Raidwide	Hits the tank first, then everyone else. Spacing required between tank and party.

Notes: For Emerald Beam, run clockwise and weave between the expanding circles. The magnet mechanic requires quick identification of charge polarity.

Phase 2

Mechanic	Type	Description
Phase Transition	AoE	Cutscene plays and arena changes. The new arena no longer has fatal edges.
Checkpoint	AoE	If the party wipes after Phase 2 starts, you restart from Phase 2, not Phase 1.
Tertius Terminus Est	AoE	Large X-shaped AoE markers. Avoid the marked zones.
Primus/Secundus Terminus Est	AoE	Sequential AoE attacks requiring movement between safe zones.
Legio Phantasmatis	Adds	Phantom soldiers spawn and attack. Handle adds while avoiding ground AoEs.

Notes: Phase 2 is more forgiving due to the arena change. Focus on learning the Terminus Est patterns.