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S2 Hard : Astei & Sterope

By Sevih · Updated May 26, 2025

Astei is a formidable support boss who heals allies, boosts attack, and resurrects her team upon enraging. Her companion Sterope punishes non-offensive skills by recovering the boss team's resources.

This guide also applies to stage S2 Hard 5-9.

Difficulty

Astei

Astei

earthhealerLv. 100
4,793Attack
2,998Defense
103,224Health
281Speed
10%Crit Chance
150%Crit DMG
0%Crit DMG Reduc
0%Penetration
0%DMG Increase
10%DMG Reduction
136Effectiveness
160Resilience
WG48WG

Lv. 100 — Story Hard · An Unpleasant Reunion

Skills

The Stars in Heaven

Single Target

Attacks an enemy and activates a Dual Attack from the ally with the highest Attack.

The Flowers on Earth

CD 3All Enemies

Heals all allies by 15% and reduces ultimate skill cooldowns by 1 turn(s). Additionally, recovers the caster's Weakness Gauge by 30%.

The Love in Our Hearts

CD 4All Enemies

Heals all allies by 25% and inflicts reduced Critical Hit Chance on all enemies for 3 turn(s).

Just a Little More Light

(Passive Effect) Increases the Attack of all allies except the caster by 15% every turn. Sterope has the following abilities: When hit, deals 1200 fixed damage to all enemies, and increases the Priority of all allies by 10%. When an enemy uses a non-attack skill, recovers all allies' Weakness Gauge by 4 and Health by 3%.

Enraged

All Enemies

Becomes Enraged when Health drops to 40% of Max Health or lower. Enraged Ultimate: Gains an irremovable effect that increases Attack and reduces damage taken for 3 turns, and Resurrects (Greater) all slain allies. Inflicts Silenced on all enemies for 3 turn(s), ignoring the target's Resilience. Does not receive Weakness Gauge damage after becoming Enraged.

Sterope

Sterope

Add
earthdefenderLv. 100
4,793Attack
2,998Defense
103,224Health
281Speed
10%Crit Chance
150%Crit DMG
0%Crit DMG Reduc
0%Penetration
0%DMG Increase
136Effectiveness
160Resilience

Lv. 100 — Story Hard · An Unpleasant Reunion

Skills

Shatter!

Single Target

Attacks an enemy. If Sterope had a buff before attacking, activates an additional attack on the same target and grants Divine Retribution. Divine Retribution: Increases damage dealt by all allies by 4%. (Max 15 stacks)

Begin the Crusade

(Passive Effect) At the start of battle, inflicts Keraunos on allies and enemies for 3 turn(s).

Fight Ferociously!

CD 4Single Ally

Grants increased Accuracy and Effectiveness to all allies for 2 turn(s).

Blind Faith

(Passive Effect) When hit, deals 500 fixed damage to all enemies. When an enemy uses a non-attack skill, recovers Weakness Gauge of all allies by 4 and Health by 3%.

Tips and teams below are written for Story Hard.

Tactical Tips

  • The boss has no immunities, so bring .
  • Try to avoid using characters with non-offensive skills.

Recommended Characters

Demiurge VladadarkrangerSteropedarkdefenderEternalfiremage

Demiurge Vlada, Sterope, Eternal

For .

Monad EvalighthealerDiannelighthealer

Monad Eva, Dianne

Can heal without using non-offensive skills.