Haze Seas: How to Get Bisento V2 From the Tremor Girl Boss

The Bisento V2 is the upgraded form of the Bisento in Haze Seas, and it only appears once you already own the base weapon and clear a single boss fight. You cannot buy the V2 directly from any shop. It arrives as a drop from the Tremor Girl boss, and the upgrade fails to register if you do not own the Bisento V1 at the time of the kill.

Quick answer: Buy the Bisento V1 for 500,000 Cash at Marine HQ Island, farm the Tremor Key from the Ice Admiral, use it at the Whitebeard gate in Marine Base Town to summon Tremor Girl, then defeat her while owning the V1 to receive the Bisento V2.

What you need before you start

Two things gate the upgrade. You must own the Bisento V1, and you must be able to survive the Tremor Girl fight, which is a level 1,000 Super Boss. If you join her fight in a party, you also need to deal at least 20% of her total HP to qualify for drops. Solo players always qualify as long as they land the killing blow.

Requirement	Detail
Bisento V1	500,000 Cash from the marksman NPC on Marine HQ Island
Tremor Key	5% drop from the Ice Admiral boss at Marine HQ
Summon spot	Whitebeard Pirates gate at Marine Base Town
Boss level	Tremor Girl, level 1,000
Party rule	Deal 20% or more of her HP to earn the drop

How to unlock Bisento V2

Go to Marine HQ Island and find the marksman NPC at the top of one of the island’s towers. Buy the Bisento V1 for 500,000 Cash. This base weapon is mandatory, since the upgrade attaches to the sword you already carry.

Stay at Marine HQ and defeat the Ice Admiral until she drops the Tremor Key. The key only drops about 5% of the time, so expect several kills before it lands in your inventory.

Take the Tremor Key to Marine Base Town and find the locked gate marked with the Whitebeard Pirates symbol. Use the key on that gate to summon Tremor Girl.

Defeat Tremor Girl while owning the Bisento V1. She drops the White Orb and the Bisento V2. Once the drop lands, your Bisento upgrades to the V2 and the new moveset becomes available.

How to confirm the upgrade worked

You know the upgrade succeeded when the Bisento V2 appears as a reward at the end of the Tremor Girl fight and the weapon’s skills switch to Shattering Core and Shattering Eclipse. If nothing drops, the most common reason is not owning the Bisento V1 first. The V2 depends on already carrying the base weapon, so buying it before the fight is the fix.

Bisento V2 moveset and mastery

The V2 carries two skills. Shattering Core is open right away, while Shattering Eclipse unlocks once you reach 25 mastery on the weapon. Its long-reaching, explosive attacks make it a strong pick for clearing mobs during the mid-game grind.

Skill	Key	Mastery requirement
Shattering Core	Z	0
Shattering Eclipse	X	25

The weapon’s design draws from the bisento carried by Whitebeard, the pirate known while alive as “The Strongest Man In the World.” Also called Edward Newgate, he stood among the four Emperors of the Sea before an early retirement and treated more than 40 people as his sons despite having no blood relation to them. That heritage is why the summon gate at Marine Base Town wears the Whitebeard Pirates mark, tying the fight directly to the blade you walk away with.