Outerpedia

Primordial Sentinel

By Sevih · Updated Mar 13, 2026

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

Primordial Sentinel

darkmageLv. 80

Immunities

5,000Attack
3,500Defense
200Speed
10%Crit Chance
150%Crit DMG
0%Crit DMG Reduc
0%Penetration
11.9%DMG Increase
7.9%DMG Reduction
160Effectiveness
240Resilience
WG40WG

Skills

Repulsor Beam

Single Target

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

Quasar Bombardment

CD 4All Enemies

Attacks 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 Enemies

Attacks 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 FireFire, WaterWater, and EarthEarth enemies. Inflicts Dual Attack Disabled on all enemies, and reduces Speed of LightLight and DarkDark 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 LightLight and DarkDark 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. StrikerStriker: +50% Priority recovery efficiency MageMage: Increased damage DefenderDefender: Inflicts reduced Defense on the Boss for 4 turns when performing an action RangerRanger: Inflicts reduced Resilience on the Boss for 4 turns when performing an action HealerHealer: 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

Glorious Sentinel

lightmageLv. 110

Immunities

6,000Attack
5,000Defense
350Speed
10%Crit Chance
150%Crit DMG
0%Crit DMG Reduc
0%Penetration
16.5%DMG Increase
11%DMG Reduction
200Effectiveness
280Resilience
WG60WG

Skills

High-Intensity Repulsor Beam

Single Target

Attacks an enemy. When the enemy is inflicted with a debuff, scores a critical hit.

Meteor Shower

CD 3All Enemies

Attacks 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 Enemies

Attacks 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 LightLight and DarkDark enemies. Reduces Speed of FireFire, WaterWater, and EarthEarth 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 FireFire, WaterWater, and EarthEarth 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. StrikerStriker: Increased damage MageMage: +50% Priority recovery efficiency DefenderDefender: Inflicts reduced Defense on the Boss for 4 turns when performing an action RangerRanger: Reduces Health of the Boss by 3% when performing an action HealerHealer: 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 SetSwiftness Set or priority boost recommended).
  • Without Monad Eva 6 stars: make sure you have at least 1 FireFire, WaterWater or EarthEarth 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

IotadarkmageStellalightranger

Iota, Stella

Priority reduction with .

NotiaearthrangerFranearthranger

Notia, Fran

Priority push with .

Valentinefireranger

Valentine

Both priority push and priority reduction .

DiannelighthealerDemiurge DeltadarkhealerSaeranearthhealerTiofirehealerNelladarkhealerAsteifirehealer

Dianne, Demiurge Delta, Saeran, Tio, Nella, Astei

HealerHealer with .

Phase 2 — Recommended Characters

Monad EvalighthealerViellaearthhealer

Monad Eva, Viella

HealerHealer with .

Mystic Sage Amelightranger

Mystic Sage Ame

Strong CP generation and as chain attack finisher.

Demiurge LunalightmageReginalightmage

Demiurge Luna, Regina

MageMage with on S1.

DrakhanlightstrikerGnosis DahliadarkstrikerDemiurge Stellalightstriker

Drakhan, Gnosis Dahlia, Demiurge Stella

StrikerStriker with on S1.

Demiurge Drakhanlightdefender

Demiurge Drakhan

DefenderDefender with on S1.

Gnosis Bethlightranger

Gnosis Beth

Pushes team priority with her DoT .

KurolightmageDemiurge VladadarkrangerGnosis Vielladarkstriker

Kuro, Demiurge Vlada, Gnosis Viella

Can remove from the boss.

Akarilightranger

Akari

Can prevent the boss from gaining .

Skadilightranger

Skadi

Cycles skill cooldowns faster with .

Suggested Teams — Phase 1

Iota
dark
mage
Iota
Valentine
fire
ranger
Valentine
Stella
light
ranger
Stella
Nella
dark
healer
Nella

Suggested Teams — Phase 2

Monad Eva
light
healer
Monad
Eva
Demiurge Luna
light
mage
Demiurge
Luna
Drakhan
light
striker
Drakhan
Demiurge Drakhan
light
defender
Demiurge
Drakhan

Combat Footage

Primordial Sentinel — Extreme — SSS rankby Sevih