System summary

Rules and progression impact

What this system does
Every 2H 35M a storm occurs in sea 2 and sea 3 for exactly 10 minutes
Key rules
Every 2H 35M a storm occurs in sea 2 and sea 3 for exactly 10 minutes · Green ghost alatar will appear in the sea 3 (location near starter island) during storm (every 2H 35M) · Cthulu Spawned via prismatic shard during the storm window [every 2H 35M].
Important numbers
Every 2H 35M a storm occurs in sea 2 and sea 3 for exactly 10 minutes · Within this 10 min Zenith Boss will spawn in Shadow Island (underground) - required for Zenith Sword (3SS quest) and Race V2 Quest. · In sea 3 storm is tied to Ghostship and Cthulhu boss. · Green ghost alatar will appear in the sea 3 (location near starter island) during storm (every 2H 35M)
How it affects progression
Level 10,000 Boss (two health bars)
Related tools
Damage Calculator · Boss Drop Planner
Source confidence
Source-listed
Last checked
July 4, 2026

Sea Events

Source notes and moves

Storm illustrated Haze Seas wiki reference card

Every 2H 35M a storm occurs in sea 2 and sea 3 for exactly 10 minutes

Within this 10 min Zenith Boss will spawn in Shadow Island (underground) - required for Zenith Sword (3SS quest) and Race V2 Quest.

In sea 3 storm is tied to Ghostship and Cthulhu boss.

Ghost Ship Spawn Method (UNRELEASED)

Green ghost alatar will appear in the sea 3 (location near starter island) during storm (every 2H 35M)

You must sacrifice 20 points worth of fruits to summon ghost ship.

Common Fruits = 1 points

Uncommon = 3 points

Rare = 5 points

Legendary = 15 points

Mythic = 20 (instant spawn)

Spawn Message: "A phantom ship rises from the abyss..."

Cthulhu Endgame Boss (UNRELEASED)

Level 10,000 Boss (two health bars)

Cthulu Spawned via prismatic shard during the storm window every 2H 35M.

Prismatic Shard must be crafted via Doran the Forge using 5 mythical materials (phantom lantern, dragon heart, Sea Beast heart, raijin core, saturn's ring)

This boss does NOT have a 20 minute despawn timer like the other bosses. It roams infinitely until death.

The shard must be fed to a whirlpool in the sea that appears during storm.

Upon summon:

- Ocean becomes nearly black

- Forced nighttime begins. Until his death.

- Screen distortion affects all players for X seconds

Server Message: "Something ancient has awakened beneath the sea..."

Sources

References for Storm

Related tools

Check the decision from another angle

More Sea Events

Related pages