Castrum Marinum (Extreme)

The extreme version of the Emerald Weapon trial with enhanced mechanics and tighter execution requirements across two phases.

Emerald Weapon

Phase 1

Mechanic	Type	Description
Emerald Shot	Tankbuster	Multi-hit tankbuster. Stack mitigation for the consecutive hits.
Optimized Ultima	Raidwide	Unavoidable raid-wide damage.
Aetheroplasm Production	AoE	Orbs spawn that must be soaked or avoided based on color/pattern.
Magitek Magnetism	AoE	Enhanced magnet mechanic. Positive/negative charges on mines determine repulsion or attraction. More mines and tighter timing than normal.
Divide Et Impera	Tankbuster / Spread	Hits tank, then spreads to party. Requires precise spacing.
Sidescathe	Cleave	Half-arena cleave. Watch for glowing wing indicator.
Emerald Beam	AoE	Spinning conal AoEs with expanding circles. Zigzag clockwise with precise movement.
Split	Knockback	Leg detachment with knockback. Position to avoid arena edges or use knockback immunity.
Primus/Secundus/Tertius Terminus Est	AoE	Sequential X-shaped and line AoE patterns. Watch order of appearance for dodge sequence.

Notes: Phase 1 mechanics are significantly more punishing. Magnet puzzles have additional mines and faster timing.

Phase 2 (Gaius Phase)

Mechanic	Type	Description
Arena Change	AoE	Platform changes—new arena for Phase 2. Serves as checkpoint.
Legio Phantasmatis	Adds	Phantom soldiers spawn in formations and execute synchronized attacks.
Expire	Raidwide	Heavy raid-wide damage when adds are defeated.
Tertius Terminus Est	AoE	Large X-pattern AoEs covering significant arena space.
Mechanized Maneuver	AoE	Emerald Weapon repositions with accompanying AoE patterns.
Enhanced Divide Et Impera	Tankbuster / Spread	Stronger version of the tankbuster spread mechanic.
Enrage	Enrage	Must defeat Emerald Weapon before enrage timer.

Notes: Phase 2 introduces the Gaius/phantom soldier mechanics. Add waves require attention while maintaining boss DPS. The checkpoint means Phase 2 practice doesn’t require re-clearing Phase 1.