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Ragnakeus

By Sevih · Updated Oct 4, 2026

Dragon of Death Ragnakeus 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

Dragon of Death Ragnakeus

Dragon of Death Ragnakeus

Lv. 80

Immunities

5,000Attack
3,500Defense
170Speed
10%Crit Chance
150%Crit DMG
0%Crit DMG Reduc
0%Penetration
11.9%DMG Increase
7.9%DMG Reduction
160Effectiveness — Sheet value: 200 (before passives)
240Resilience — Sheet value: 300 (before passives)
WG30WG

Skills

Pulverizing Dragvider

All Enemies

Attacks all enemies. After attacking, increases Priority of the caster by 40%.

Roaring Breathstream

CD 4All Enemies

Attacks all enemies. After attacking, gains an extra turn, and increases Defense for 4 turn(s).

Proclaimed Deathstroy

CD 8All Enemies

Removes all buffs from all enemies, and deals 95% of the target's Max Health as fixed damage to Light and Dark enemies and attacks all enemies. This skill does not miss.

Dragon of Death Ragnakeus

(Passive Effect) Increases damage taken from Fire, Water, and Earth enemies. Reduces Speed of Light and Dark enemies. This effect cannot be removed. When hit, increases Priority of the caster by 20%. Reduces Weakness Gauge damage taken from skills other than Burst Skills, Dual Attacks, and Skill Chains by 50%. When granted increased Defense, reduces Weakness Gauge damage taken by 100%. Recovers 10% Weakness Gauge every turn. Damage from Cursed/fixed damage does not exceed 10000/20000 respectively. (Excludes fixed damage from Skill Chains) Greatly increases damage dealt inversely proportional to the number of targets. Enemies killed by Dragon of Death Ragnakeus cannot be Resurrected or Revived.

Emperor of Armageddon

(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: Fixes Priority recovery efficiency of the Boss to 60%

Mecha Dragon of Death Ragnakeus

Mecha Dragon of Death Ragnakeus

Lv. 110

Immunities

6,000Attack
5,000Defense
200Speed
10%Crit Chance
150%Crit DMG
0%Crit DMG Reduc
0%Penetration
16.5%DMG Increase
11%DMG Reduction
200Effectiveness — Sheet value: 250 (before passives)
280Resilience — Sheet value: 350 (before passives)
WG35WG

Skills

Corroding Dragvider

All Enemies

Attacks all enemies. After attacking, increases Priority of the caster by 70%.

Eroding Breathstream

CD 4All Enemies

Attacks all enemies. After attacking, when the caster is not inflicted with Reduced Defense, resets the skill cooldown of Caustic Deathstroy. After attacking, gains an extra turn.

Caustic Deathstroy

CD 8All Enemies

Removes all buffs from all enemies, and deals 95% of the target's Max Health as fixed damage to non-Light and non-Dark enemies and attacks all enemies. Gains a Barrier for 8 turn(s). This skill does not miss.

Mecha Dragon of Death Ragnakeus

(Passive Effect) Increases damage taken from Light and Dark enemies. Reduces Speed of Fire, Water, and Earth enemies. This effect cannot be removed. When hit, increases Priority of the caster by 30%. Reduces Weakness Gauge damage taken from skills other than Burst Skills, Dual Attacks, and Skill Chains by 50%. When granted a Barrier, reduces Weakness Gauge damage taken by 100%. Recovers 10% Weakness Gauge every turn. Damage from Cursed/fixed damage does not exceed 10000/20000 respectively. (Excludes fixed damage from Skill Chains) Greatly increases damage dealt inversely proportional to the number of targets. Enemies killed by Mecha Dragon of Death Ragnakeus cannot be Resurrected or Revived.

Emperor of Ruin

(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: 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

Tips and teams below are written for Extreme League.

Strategy

  • The boss's main characteristic is its . Fast units are recommended.
  • Anything that can limit priority gain is useful: , , the Sacreed Edge weapon, or Demiurge Vlada (20% reduction at 4 stars, 50% at 5 stars).
  • Like most World Bosses, the best strategy is to break the boss as often as possible. Key focus areas are CP generation and Weakness Gauge damage.

Phase 1

  • Bring , , or to counter boss .

Phase 2

  • Bring , , or to counter boss .
  • Defender recommended to prevent the S3 reset if you want to bring Fire, Earth, Water.

Phase 1 — Recommended Characters

ViellaNotiaLaine

Viella, Notia, Laine

sources.

Saeran

Saeran

Nice and .

ValentineTamara

Valentine, Tamara

options.

FranLaplaceTamamo-no-MaeRyu LionHeatwave Cop Delta

Fran, Laplace, Tamamo-no-Mae, Ryu Lion, Heatwave Cop Delta

Starter/Finisher options.

LunaAmeChristinaNoa

Luna, Ame, Christina, Noa

Finisher options to generate CP thanks to .

LunaCarenChristinaRyu LionHeatwave Cop DeltaPoolside Trickster Regina

Luna, Caren, Christina, Ryu Lion, Heatwave Cop Delta, Poolside Trickster Regina

and options.

Veronica

Veronica

Can the boss (breaking the boss clears it).

Phase 2 — Recommended Characters

Monad EvaDemiurge Delta

Monad Eva, Demiurge Delta

Healer with .

Demiurge Drakhan

Demiurge Drakhan

Defender with nice CP generation and on S1.

Demiurge Vlada

Demiurge Vlada

Starting from 4 stars, reduces priority gain efficiency by 20% (50% at 5 stars).

Gnosis NellaDemiurge StellaIotaRyu LionHeatwave Cop Delta

Gnosis Nella, Demiurge Stella, Iota, Ryu Lion, Heatwave Cop Delta

Starter/Finisher options.

Gnosis NellaTamamo-no-Mae

Gnosis Nella, Tamamo-no-Mae

options to stall the boss's S2.

Gnosis Beth

Gnosis Beth

gives to the whole team.

AkariFrancescaReginaElizaGnosis ViellaStella

Akari, Francesca, Regina, Eliza, Gnosis Viella, Stella

, , and options.

Suggested Teams — Phase 1

Suggested Teams — Phase 2

Combat Footage

Dragon of Death Ragnakeus — Extreme — SSS rankby Sevih