How to Unlock Both Haki Types in Lineage Piece

Lineage Piece has two Haki types you can unlock right now, and both matter for mid and late game combat. Observation Haki gives you 10 automatic dodges, while Armament Haki, called Bosu Haki in game, raises your damage by 25%. One is locked behind a long questline, the other behind a rare item drop.

Quick answer: Get Observation Haki by reaching Level 1500, completing the Deeproot Jungle Island questline, and paying 2.5M Yen. Get Armament (Bosu) Haki by farming the Haki Book from any mob or boss, then handing it plus 1,250 Gems to the Bosu Haki NPC on Frostborn Island.

Haki types, effects, and unlock costs

Haki	Effect	Requirements
Observation Haki	Grants 10 dodges	Level 1500+, Observation Haki Book, 2.5M Yen
Armament Haki (Bosu Haki)	+25% damage boost	Haki Book, 1,250 Gems

Conqueror’s Haki is not in Lineage Piece. Only Observation and Armament Haki exist at this time.

How to unlock Observation Haki

Observation Haki comes from a questline handed out by an NPC on Deeproot Jungle Island. You must be at least Level 1500 to start it, so this is a late game unlock.

Travel to Deeproot Jungle Island and head to the wooden bridge in the center. The Observation Haki NPC stands at one end of that bridge. Talk to him to begin the quest.

Observation Haki active on a Lineage Piece character.

Defeat 40 World Bosses anywhere on the map. Any World Boss counts toward the total. Deku the Verdant Hero is currently the weakest World Boss, which makes him the fastest target for clearing this requirement.

Return to the Observation Haki NPC to receive the torch task, then find and light 5 torches spread across the map. Lighting the fifth torch automatically gives you the Observation Haki Book, an untradeable one-time quest item.

In-game prompt showing E to light up a torch

Torch	Location
Deeproot Jungle Island	On the trunk of a tree on the left side of the wooden bridge from the spawn point
Frostborn Island	Behind a street lamp near the Level 601 to 800 Quest NPC on a single tree
Legend’s Arena Island	On the outside of the rightmost pillar behind a tree near the Saber NPC
Fossil Island	On the trunk of the tree right beside the Muzan NPC near the Sung Jinwoo Boss area
Scorched Ruins Island	On the leftmost tree from the spawn point heading left

Go back to the Observation Haki NPC on Deeproot Jungle Island one last time. Hand over the Observation Haki Book along with 2.5M Yen, and he teaches you Observation Haki. You then have your 10 dodges active in combat.

How to unlock Armament (Bosu) Haki

Armament Haki has a much shorter unlock, but the required Haki Book is a rare drop, so the grind is the real hurdle.

Farm the Haki Book. It drops from any mob NPC or boss in the game with a flat 0.1% chance. Every enemy shares this same low rate, so keep clearing mobs until it drops.

Storage menu open on the Material tab showing collected items

Collect 1,250 Gems. Gems come from completing quests, defeating World Bosses, and redeeming active Lineage Piece codes. Claim every available code to top up your supply while you grind for the book.

Head to Frostborn Island and find the Bosu Haki NPC. Hand over the Haki Book and 1,250 Gems, and Armament Haki is yours.

Buso Haki NPC prompt showing press E to buy Buso Haki

How to reroll Armament Haki color

Armament Haki spawns with a random color. The color is purely cosmetic and does not change your stats, but you can swap it using Haki Color Rerolls.

Drops from all mob NPCs and bosses
Found in Rare, Epic, Legendary, and Mythical Chests

Use a Haki Color Reroll straight from your inventory to change the color of your Armament Haki whenever you like.

If you are still early, prioritize the Haki Book grind for Armament Haki since its 25% damage boost speeds up every fight, including the World Bosses you will need for the Observation Haki questline. Once you cross Level 1500, the Deeproot Jungle Island quest becomes the next milestone toward your full set of dodges.