
The High-Difficutly Quest Campaign "強敵襲来SS級 -宇宙の孤島にて-" will be held starting from May 12, 2026 (Tue) at 6:00 pm.
"強敵襲来SS級 -宇宙の孤島にて-" is a high-difficulty quest designed for veteran Observers!
In the limited-time quests appearing in "強敵襲来SS級 -宇宙の孤島にて-", you can obtain "Parallel Quartz" (a Hero Growth item) as a first-clear reward, as well as Titles through mission rewards.
*Titles can be claimed from "Missions" on the Home screen after clearing the quest. Please note that missions have a deadline for claiming rewards, so be sure not to forget to collect them.
The limited-time quests added in "強敵襲来SS級 -宇宙の孤島にて-" require 0 Stamina and can be played as many times as you like during the event period.
■ May 12, 2026 (Tue) at 6:00 pm to May 26, 2026 (Thu) at 2:00 pm (Scheduled)
Quest Available Period: Until May 26, 2026 (Thu) at 2:00 pm
Mission Reward Claim Period: Until June 2, 2026 (Thu) at 8:00 pm
In the limited-time quests added in "強敵襲來SS級 -宇宙の孤島にて-", special effects different from regular quests will be active.
The special effects active in this campaign's quests are as follows:
| Special Effect | Effect Details |
|---|---|
| No Buff/Debuff stacking | Buffs and debuffs of the same type will not stack. (Applies to all allies and enemies) |
| Depleting the enemy's Resistance Gauge gives the enemy a debuff. | The enemy's Resistance Gauge decreases when taking damage. When the Resistance Gauge reaches 0, give the enemy +50% Damage Taken & SPD-30 for 1 action. |
In this event's Challenge Quests, enemies have a "Resistance Gauge".
The Resistance Gauge is a blue gauge displayed below each enemy's HP gauge.
The Resistance Gauge decreases when taking damage, and when the gauge reaches 0, give the enemy +50% Damage Taken & SPD-30 for 1 action.
Additionally, when the ally dealing damage is given SPD Up & the enemy taking damage is given SPD Down, the Resistance Gauge can be reduced even further.
A Resistance Gauge that has reached 0 will be fully restored at the start of the enemy's action.
*The maximum value of the enemy's Resistance Gauge varies depending on the quest and the enemy.
Make good use of the debuff effects given to the enemy by reducing their Resistance Gauge to gain the upper hand!
The following characters are eligible for bonuses in the limited-time quests added in "強敵襲來SS級 -宇宙の孤島にて-". When these eligible characters are added to a team, they can receive unique bonuses based on their respective roles.

■ Bonus Characters
| Character Type | Character Name | Bonus Details |
|---|---|---|
| Hero | "Dyadic Dreams" Andrew: Hero | ATK+50% |
| Hero | "Boundless Voyage" Huckle: Hero | While alive, damage all allies deal increases by SPD difference with target x 2%. |
| Hero | Reticul | While alive, damage all allies deal increases by SPD difference with target x 2%. |
| Sidekick | Reticul | Base HP +1000, Base ATK +500, 250 less damage taken. |