Dark War Survival enters a new chapter with Season 5: Sealed Island, bringing major content additions, long-term systems, and an extended season duration. From the mysterious lore of the Oni King to new mechanics like Miasma Infection, this update expands the game’s world with deeper strategy and risk-based progression.
Here’s everything you need to know about Season 5 — including new systems, weekly phases, event features, and reward structure.
Dark War Season 5 Sealed Island Guide – All Weeks Missions
The new season, titled Sealed Island, officially begins Monday, October 13, 2025, following the conclusion of Season 4.
This season is slightly longer than usual, lasting 9 weeks (63 days) instead of the standard 8-week cycle.
Core Theme
Season 5 centers around the awakening of the Oni King Suten Doji, whose rage and corrupted aura seep into the world through miasma, infecting monsters, troops, and the environment itself.
The result — a darker, more survival-driven setting that challenges players to maintain resistance, purify corruption, and adapt to an evolving battlefield.
Lore and Setting
According to the season preview:
“In the depths of Maple Isle, the unrivaled Oni King Suten Doji has long been sealed. As the ages passed and chaos grew, the seal fractured, releasing miasma — a fog of resentment and fury that corrupts all life it touches.”
This corruption introduces new monsters, altered landscapes, and unique challenges across the season’s events.
New Features and Systems
1. Soul Stone Territories
Alliances can now capture Soul Stone territories that automatically produce Soul Stones over time.
Soul Stones serve as a key seasonal currency and influence settlement rewards.
During the Soul Stone Scramble (PvP phase), players can plunder up to 20% of enemy alliance points — making territory control more competitive than ever.
2. Miasma System
The Miasma mechanic defines Season 5’s survival focus.
Miasma is a red, corrupted fog created by the Oni King’s grudge that spreads across battlefields and shelters.
Key Rules:
- Miasma Infection: If your troop’s Virus Resistance is lower than the target zombie’s corruption level, infection occurs after combat.
- Miasma Stack: Fighting infected zombies increases your Miasma Stack, leading to shelter debuffs and decreased troop efficiency.
- Spreading Effect: Troops carrying miasma transfer it to enemy shelters after victorious attacks.
- Alliance Purification: Members can assist each other to purify shelters, lowering Miasma Stacks faster through cooperation.
Virus Resistance:
- Virus Resistance resets at the start of each season.
- Upgrading specific seasonal buildings increases resistance.
- Higher resistance allows you to fight stronger corrupted enemies safely.
3. Miasma Monsters
Two new corrupted monster types have been introduced on Maple Isle:
| Monster Type | Description | Notes |
|---|---|---|
| Rooting Oni | A ground-based corrupted creature spreading infection through direct combat. | Standard hunting target. |
| Vuj Brute | Large boss-type creature requiring alliance rallies. | Drops higher-tier materials. |
Fighting these enemies builds Miasma Stacks, so resistance and teamwork are essential.
4. Magatama Artifact System
Introduced as a new collectible artifact type.
Symbolizes “Soul and Life” and can be exchanged for exclusive rewards in the Lance Night Shop.
Unused Magatama vanish at the end of the season, encouraging continuous engagement.
5. Weekly Shop and Event Currency
Similar to Season 4, Season 5 features a Weekly Shop tied to ongoing seasonal events.
The shop allows Magatama exchanges for exclusive items and equipment fragments.
Availability may rotate weekly, depending on active events.
New Seasonal Events
1. YUM Corner (Card-Matching Mini Event)
A new side event where players match three identical cards to clear stages.
Each completed stage rewards seasonal items or fragments.
This event emphasizes timing and memory rather than combat power, making it accessible for all players.
2. Parade Float
Described as an “Evil Spirit Escort”, this event features a visual procession across Maple Isle, combining Halloween-like visuals with strategic reward nodes.
Though limited details exist, it appears to operate similarly to previous escort-based defense events.
3. Sacred Blessing
The Sacred Blessing Amulet is a new temporary item usable across multiple seasonal events.
- Offers various temporary boosts and can be spent for short-term rewards.
- Automatically removed after Season 5 concludes.
New Seasonal Skin
Season 5 introduces a new Sacred Maple Tree Base Skin, described as crystallized energy formed from the Oni King’s fury.
This skin will be unlocked as a final season reward and likely distributed after the 9-week duration ends.
At launch, it is not yet available in the Decoration menu but will appear once the season progresses.
Season Duration
| Season | Start Date | End Date (Est.) | Duration |
|---|---|---|---|
| Season 5 – Sealed Island | October 13, 2025 | December 15, 2025 | 9 Weeks (63 Days) |
This longer timeline allows more breathing room for events, resource farming, and alliance development compared to previous seasons.
Expected Weekly Phases
Based on internal game files and preview text, here’s what to expect:
| Week | Event Focus | Details |
|---|---|---|
| Week 1 | Miasma Introduction | Unlock virus resistance, fight early corrupted zombies. |
| Week 2 | Parade Float Event | Escort challenge with visual rewards. |
| Week 3 | Sacred Blessing Event | Collect prayer amulets for buffs. |
| Week 4 | Glory War | Standard cross-server PvP phase. |
| Week 5–8 | Soul Stone Scramble | Main alliance competition with plundering system. |
| Week 9 | Settlement & Rewards | Distribution of permanent skins and season-end items. |
Additional Notes
- Virus Resistance Reset: All players’ virus resistance levels are set to Level 1 at season start.
- Trade War Returns: A revised trade war mode will reappear mid-season, offering resource and fragment exchanges.
- Building Materials: Two new seasonal materials — Stone and Quad — are required for constructing new island structures (Forge Factory, Sea Hall).
- Alliance Alter Mechanic: Enables alliances to manage shared resources for seasonal construction.
Season 5: Sealed Island is one of the most ambitious Dark War Survival updates yet, combining lore, corruption systems, and longer-term objectives.
Key takeaways:
- Miasma mechanics redefine infection-based gameplay.
- Soul Stone Scramble expands alliance warfare.
- Virus Resistance becomes the new meta stat.
- New skins, shops, and events maintain long-term engagement.
Prepare early — gather resources, strengthen alliance coordination, and be ready to adapt to Miasma’s spread when the new season begins.