Blue Protocol Star Resonance Stimen Vaults reset on October 8, 2026, alongside Lightchase Oath Season 4. Only the first 20 floors are available in the opening cycle. Ten additional floors unlock in each later cycle, beginning with the October 19 reset. The Vaults also contain new seasonal monsters with Oath Strength, changing the difficulty and rewards.
If you’ve cleared floor 20 and cannot progress, you’re probably at the intended release cap, not missing a secret unlock. The first cycle is shorter than usual, while Solo, Duo and Skip Floor access expand over time. Here are the dates and floor limits, plus what to check if your damage suddenly feels lower than last season.
Blue Protocol Star Resonance Stimen Vaults: Season 4 floor schedule
The developer says the first season cycle opens floors 1–20. Each following cycle adds ten more floors, gradually increasing how far players can go. Higher gear doesn’t let you bypass a floor block that hasn’t been released yet.
| Cycle | Available floors | Timing |
|---|---|---|
| First | 1–20 | October 8 to 19 |
| Second | Through floor 30 | From October 19 reset |
| Third | Through floor 40 | Following biweekly cycle |
| Later | Ten additional floors each cycle | Biweekly unlock pattern |
Those are scheduled availability limits, not a guarantee that every character can clear the newest stage. You still have to fight through the floors you can access. The official notes don’t provide a separate list of every enemy and reward for each numbered floor.
Official Lightchase Oath Season 4 artwork. Image credit: Blue Protocol: Star Resonance.
When do Blue Protocol Star Resonance Stimen Vaults reset?
Season 4’s first cycle begins after the October 8 maintenance and ends on October 19 at 02:00 (UTC-2), which is 5:00 a.m. BST in the UK. The first cycle is deliberately shorter to accommodate the changeover from Season 3.
After October 19, the regular biweekly refresh schedule resumes. Check the in-game Vault countdown for later exact reset times, particularly after seasonal clock changes. Don’t assume the content resets at midnight in your local timezone.
Why floor 21 is locked in Blue Protocol Star Resonance Stimen Vaults
During the first cycle, floor 21 is not supposed to be open. The developers capped access at floor 20 until the next release stage. You can’t force the following ten floors open by playing a different class, gaining more Oath Strength or purchasing a pass.
Come back after the October 19 reset to access the next ten-floor block. The same staged progression applies to future cycles, so seeing a higher numbered floor unavailable isn’t necessarily a bug.
Blue Protocol Star Resonance Stimen Vaults: Oath Strength and enemy damage
The Vault monsters now belong to the new season and have Oath Strength. When your Oath Strength is lower than an opponent’s, your damage and healing are greatly reduced and incoming damage increases. That can make an old build feel unexpectedly weak.
If your Oath Strength is higher than a Season 4 opponent’s, each 150 points of advantage increases damage dealt by 5% and healing by 2%, up to 20% damage and 8% healing. The advantage doesn’t apply simply because you entered a Vault. Check the actual stat comparison before choosing a tougher floor.
Players struggling with Blue Protocol Star Resonance Stimen Vaults should review their Season 4 equipment and progression before repeating the same attempt. The Oath Strength guide explains the penalties and bonuses in detail.
Official Season 4 progression image. Image credit: Blue Protocol: Star Resonance.
What rewards do Blue Protocol Star Resonance Stimen Vaults give?
The October patch refreshes Vault monsters and the rewards associated with them for Season 4. It doesn’t contain a verified floor-by-floor loot table, so it’s too early to assign guaranteed items or percentages to individual floor numbers. Check the available rewards in your updated game as you unlock each stage.
Don’t confuse Vault rewards with Oath Dust and Oath Silk earned through Chaotic Realm. Those materials have separate dungeon drop limits and cosmetic exchanges, detailed in our Oath Dust and Oath Silk guide.
Blue Protocol Star Resonance Stimen Vaults: Solo, Duo and Skip Floor changes
The developer confirms that Solo, Duo and Skip Floor access will gradually expand through later cycles. This doesn’t promise that every option reaches every floor as soon as Season 4 starts. A capped Skip Floor destination may simply reflect the current cycle’s restrictions.
If the skip option is missing or won’t reach the highest stage you expected, compare its displayed limit with the current floor release. Switching modes doesn’t guarantee a way around the seasonal cap.
How to prepare for the next Blue Protocol Star Resonance Stimen Vaults cycle
The first deadline is October 19. Finish the floors currently available if you want to complete that cycle, and review your Oath Strength before the next ten floors arrive. Season 4 also adjusts the way Crit, Haste, Luck, Mastery, Versatility and Block scale from fixed values, so your stats may differ from last season.
The new Matrix Manifestation system gives you more ways to refine Factors and Imprints, but doesn’t remove Vault floor caps or Oath Strength penalties. Blue Protocol Star Resonance Stimen Vaults advances by cycle: the first 20 floors now, ten more on October 19, then further releases on the biweekly schedule.
For October’s separate Halloween activities, see our Mischief Night event guide. Its pumpkin treasures, sticker boards and Nightveil Woods challenges use different reward rules from Stimen Vaults.
Official source: Blue Protocol: Star Resonance October Season 4 patch notes.
