Rainbow Haki in Blox Fruits is unlocked by completing the Horned Man quest line in the Third Sea. The usual requirement is level 1950 or higher, then you talk to the Horned Man on Floating Turtle and finish his boss-kill quests one by one.

Steps

  1. Go to the Third Sea and head to Floating Turtle.
  2. Find the Horned Man near the mansion/tree area.
  3. Accept and complete his quest chain.
  4. Defeat the required bosses in order: Stone , Island Empress , Kilo Admiral , Captain Elephant , and Beautiful Pirate.
  1. After finishing the chain, return and enable the Rainbow Haki color at the Color Specialist or Haki color NPC.

Notes

  • You need access to the Third Sea, so this is not a beginner unlock.
  • Some bosses may require server hopping if they are not spawned yet.
  • Videos and guides from 2022–2025 consistently describe the same unlock path, so the method appears stable.

Quick scoop

The short version is: reach Third Sea, talk to Horned Man, beat the quest bosses, then equip the Rainbow Haki color.