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Adventure

S2 Hard : Astei & Sterope — Outerplane Adventure Guide

By SevihUpdated 2025-05-26
Strategy Guide

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.
Astei

Archbishop of Sacreed

Astei

EarthEarthHealerHealerLv.100

4-10 : An Unpleasant Reunion (Story (Hard))

Immunities
The Stars in Heaven

The Stars in Heaven

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

The Flowers on Earth

The Flowers on Earth

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

The Love in Our Hearts

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

Just a Little More Light

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

Enraged

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.

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Tactical Tips

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

Recommended Characters

Demiurge Vlada
Dark
Ranger
Sterope
Dark
Defender
Eternal
Fire
Mage

Demiurge Vlada, Sterope, Eternal

For .

Monad Eva
Light
Healer
Dianne
Light
Healer

Monad Eva, Dianne

Can heal without using non-offensive skills.