The Primordial Sentinel is a challenging two-phase world boss that requires precise team coordination and timing. This guide covers strategies for defeating this boss up to the Extreme League.
Difficulty

Primordial Sentinel

Lv. 80Immunities
Skills

Repulsor Beam
Single TargetAttacks an enemy, then has a 100% chance to increase Critical Hit Chance of the caster for 2 turn(s).

Quasar Bombardment
CD 4All EnemiesAttacks all enemies. For each target damaged, reduces Chain Points of enemies by 5. When the enemy is inflicted with Shocked, additionally reduces Chain Points by 20 each.

Particle Disintegration
CD 8All EnemiesAttacks all enemies, and has a 100% chance to inflict Shocked on the target for 2 turn(s). This attack ignores the target's Immunity. When scoring a critical hit, grants Core Energy to the caster for 1 turn(s).

Primordial Weapon
(Passive Effect)
Increases damage taken from
Fire,
Water, and
Earth enemies.
Inflicts Dual Attack Disabled on all enemies, and reduces Speed of
Light and
Dark enemies. This effect cannot be removed until the Boss is killed.
Reduces damage taken from skills other than Burst Skills and Skill Chains, and reduces Weakness Gauge damage taken by 50%.
Greatly reduces damage taken from
Light and
Dark enemies, and does not take Weakness Gauge damage.

Totalizing Degradation!
All Enemies(Passive Effect) Grants Courage Against Despair to the enemy team. Grants a special effect to the enemy team based on their class.
Striker: +50% Priority recovery efficiency
Mage: Increased damage
Defender: Inflicts reduced Defense on the Boss for 4 turns when performing an action
Ranger: Inflicts reduced Resilience on the Boss for 4 turns when performing an action
Healer: Inflicts reduced Speed on the Boss for 4 turns when performing an action.
(Triggered Effect) After using Repulsor Beam and Quasar Bombardment, when granted Core Energy, attacks all enemies. After attacking, grants increased Speed for 5 turn(s).

Glorious Sentinel

Lv. 110Immunities
Skills

High-Intensity Repulsor Beam
Single TargetAttacks an enemy. When the enemy is inflicted with a debuff, scores a critical hit.

Meteor Shower
CD 3All EnemiesAttacks all enemies. When the target is inflicted with Shocked, inflicts reduced Attack for 2 turn(s). This effect cannot be removed.

Supernova Explosion
CD 4All EnemiesAttacks all enemies, and has a 100% chance to inflict Shocked on the target for 2 turn(s). This attack ignores the target's Immunity. After attacking, grants Core Energy to the caster for 1 turn(s).

Heir of Glory
(Passive Effect)
Increases damage taken from
Light and
Dark enemies. Reduces Speed of
Fire,
Water, and
Earth enemies. This effect cannot be removed.
Reduces damage taken from skills other than Burst Skills, Dual Attacks, and Skill Chains, and does not take Weakness Gauge damage.
Greatly reduces damage taken by
Fire,
Water, and
Earth enemies, and does not take Weakness Gauge damage.
Damage from Cursed/fixed damage does not exceed 30000.

For the Glory of Old!
All Enemies(Passive Effect) Grants Courage Against Despair to the enemy team. Grants a special effect to the enemy team based on their class.
Striker: Increased damage
Mage: +50% Priority recovery efficiency
Defender: Inflicts reduced Defense on the Boss for 4 turns when performing an action
Ranger: Reduces Health of the Boss by 3% when performing an action
Healer: Inflicts reduced Speed on the Boss for 4 turns when performing an action.
(Triggered Effect) After using High-Intensity Repulsor Beam and Meteor Shower, when granted Core Energy, attacks all enemies.
After attacking, grants increased Speed for 5 turn(s), and fully reduces Chain Points of enemies.
Tips and teams below are written for Extreme League.
Phase 1
- Abuse priority gain and reduction as much as possible to maximize your turns.
- Equip Sage and Rogue charms for Skill Chains and CP generation (don't forget critical hit chance for Rogue).
- In both phases, bring at least 1 healer for the thanks to the buff.
- You have 2 ways to keep the Chain Points you accumulated during Phase 1 — see the Transition section below.
Phase Transition
- If you have Monad Eva at 6 stars: her mere presence will apply to the boss, preventing its extra attack that removes all your CP. You can swap to Team 2 before the transition (safest) or after it — but swapping after requires your team to be fast enough to act before the boss (

Swiftness Set or priority boost recommended). - Without Monad Eva 6 stars: make sure you have at least 1
Fire,
Water or
Earth character in Team 2. - Swap to Team 2 near the Phase 2 threshold (1.2M damage). Let the boss play, then push it into Phase 2. The boss plays again and gains its buff — break it before its next turn to remove the buff and avoid its extra attack that strips your CP.
Phase 1 — Recommended Characters
Phase 2 — Recommended Characters
Strong CP generation and as chain attack finisher.
Mage with on S1.
Drakhan, Gnosis Dahlia, Demiurge Stella
Striker with on S1.
Defender with on S1.
Pushes team priority with her DoT .
Kuro, Demiurge Vlada, Gnosis Viella
Can remove from the boss.
Can prevent the boss from gaining .
Cycles skill cooldowns faster with .



























