Genshin Impact: Complete Guide to Hiisi Island Evermoon Seals and Treasure Vaults

Genshin Impact: Complete Guide to Hiisi Island Evermoon Seal and Treasure Vault Locations

Genshin Impact's Version [Not stated in official materials] deployment continues the Nod-Krai saga with Hiisi Island, introducing a fresh layer of collectible-driven exploration. The region’s Evermoon Seal and Treasure Vault mechanics are now front and center for completionists and Archon Quest progressors alike. With challenging puzzles, time-sensitive events, and concurrency with ongoing banners, knowing exactly how and where to secure every Evermoon Seal is essential for maximizing regional rewards.

At a Glance: Hiisi Island’s Evermoon Seal Update

• Update Context: Major Hiisi Island expansion — introduces Evermoon Seals, Treasure Vault.
• Seals Required: Three Evermoon Seals needed to unlock the Hiisi Island Treasure Vault.
• Acquisition Method: Each seal is locked behind Precious Chests, with some requiring event quest completion.
• Relevant Quests: “For a Green Island” and “The Mirrors, the Maze, and the Tsar.”
• Key Rewards: Vault-exclusive loot, Primogems, materials, and rare regional collectibles.
• Event Overlap: Occurs mid-phase, conflicting with ongoing banners (see Banner Schedule).

Hiisi Island Evermoon Seal Overview

The Evermoon Seal is a unique Nod-Krai region artifact introduced as part of the Hiisi Island content drop. Like the Obsidian Ring on other islands, the Evermoon Seal can only be secured from select Precious Chests — several of which are gated behind new story and puzzle-based events. Securing all three seals is mandatory for accessing the region’s Treasure Vault, making these chests high-priority objectives for both F2P completionists and endgame min-maxers.

Timeline & Banner Schedule Overview

Official banner schedules for this phase have not been fully detailed in available patch notes. However, based on in-game event cues, the Hiisi Island Treasure Vault content runs concurrently with existing character and weapon banners. Plan resin and Primogem allocations accordingly if chasing limited-time units.

| Phase | Estimated Start | Estimated End | Overlap (TZ not stated) |
|————————- |———————–|————————|———————————————————-|
| Hiisi Island Vault Quests| Not stated | Not stated | Active during current Nod-Krai mid-phase |
| Current Banners | [See EarlyGG banners] | [See EarlyGG banners] | Overlapping; plan collection around banner pulls |

Not stated in official materials; check EarlyGG's event tracker for real-time updates.

Key Quests & Evermoon Seal Locations

For a Green Island (Quest Chain)

• Access: Teleport to the Thunderclap Reef – NE waypoint. Progress the main quest chain.
• Steps:
  • Enter the cave, collect quest Fragments, manipulate Kuuhenki Energy, and interact with robot NPCs.
  • Complete navigation and puzzle segments, dispatched enemy encounters, and trigger Moon Mirrors.
  • Each completed segment unlocks a Precious Chest; one (randomized) contains an Evermoon Seal.
• Notable: Early quest progression is essential, as skipping dialogue or pathfinding can lock you out of rewards during the event window.

The Mirrors, the Maze, and the Tsar

• Access: Waypoint south of Light-Bathed Platform, descend into marked pit.
• Steps:
  • Sequential cave segments with a focus on pushing and destroying obstacles (Lakkaberries, Rock Crab mechanics).
  • Advanced puzzle mechanics: mirrors, energy plants, boss-tier Crab Tsar encounter.
  • Collect unique Fragments; defeat adversaries blocking chest access.
  • Two Precious Chests spawn here; again, Evermoon Seal assignment is random.
• Reward: Quest completion yields additional chests, a Luxurious Chest, and essential seal progress.

Standalone Precious Chests (Hiisi Island Core Region)

• Up to twelve Precious Chests are scattered across Hiisi Island, with at least one off-quest chest housing a possible Evermoon Seal.
• Notable interactions: Defeating Radiant Beasts, solving block and Moon Mirror movement puzzles, and clearing mob dens.

Player Tip: If you do not obtain all three Seals from the initial quest completions, continue exploring residual chest spawns across the island. Seal allocation per chest is randomized and may require some backtracking.

Treasure Vault Location & Opening

• Vault Coordinates: Eastern shore, Frostmoon Enclave — accessible by teleporting to the Frostmoon Enclave waypoint and moving east.
• Opening Mechanism: Requires all three Evermoon Seals in inventory; seals are consumed on use.
• Notable Vault Rewards: Contains region-exclusive loot, enhancement materials, and Primogems (exact listings not stated in official materials).

Events and Rewards Recap

• Eligibility: Participation in the Hiisi Island event questlines and successful collection of all required seals.
• Objectives: Complete all puzzle and combat challenges; claim every chest in zone for maximum efficiency.
• Deadline: Not explicitly stated — event quests in Genshin Impact often reset with the patch, so complete as soon as possible.

Action Plan: F2P, Low-Spend, and Optimizers

• F2P/Low-Spend: Prioritize main event quests first; do not waste stamina on chests outside quest objectives until both major quests are clear.
• Optimizers: Track chest locations as you progress (manual map markers recommended); optimize for daily resin usage by bundling combat tasks with chest routes.
• All Players: Check if you have three Evermoon Seals before attempting the Vault. If missing, revisit any unsolved chest or unfinished quest segment.
• Preparation: Bring strong AoE and puzzle-proficient characters. Electro, Geo, and Anemo units with strong crowd control or movement support excel in Hiisi Island’s caveoffs.

Industry Trends & Community Implications

The introduction of the Evermoon Seal randomization among chests is notable for its increased replay value. However, it has drawn mixed feedback from the player base—some praise the flexibility and replay factor, while others express frustration at RNG gating for critical regional progression. With Hiisi Island’s event window overlapping certain limited banners, strategic planning is essential — F2P and low-spend players should avoid unnecessary pulls or stamina use until regional objectives are complete.

Fresh Angle: As gacha-exploration content deepens, HoYoverse’s pivot toward puzzle-combat hybrid mechanics indicates a long-term vision for non-linear reward structures and recurring region-limited artifacts. Watch for similar implementations in future zones.

What to Watch Next

• Potential Unconfirmed Events: No official leaks or timeline extensions present. All future updates subject to HoYoverse’s official channels.
• Completionists: Track EarlyGG's live regional guides for emergent chest migrations, bugfixes, or extended event timelines.
• Ongoing Banners: Plan Primogem expenditure around event deadlines; banners may overlap with Vault closing windows, so consult the internal banner schedule guide.

Conclusion

Hiisi Island’s Evermoon Seal and Treasure Vault cycle introduces a distinctly nonlinear upgrade loop to Genshin Impact’s regional content design. Whether you're chasing Primogems or finishing the region’s new story arcs, effective planning, careful quest navigation, and quick adaptation to chest randomization are crucial to unlocking every reward. For the latest updates, optimization routes, and event reminders, follow EarlyGG’s Genshin Impact guides.

Alt Text Suggestions:
– "Map showing Hiisi Island with all Precious Chest and Vault locations marked – visual route guidance for players optimizing chest collection."
– "Screenshot of the Hiisi Island Treasure Vault interface, illustrating the Evermoon Seal requirement panel before opening."