Martial Arts Master (Superhuman) - Blox Fruits

The Martial Arts Master is the shop NPC who teaches the Superhuman fighting style for 3,000,000 Beli. He will only sell it to you once you have 300 Mastery or higher on all four V1 fighting styles in the game. The purchase is permanent: like all fighting styles, you can come back to see him to relearn Superhuman for free, even after switching to another one. His signature quote: « Keep practicing your martial arts! »

How to get it

Two locations: Snow Mountain in the Second Sea, and Castle on the Sea in the Third Sea. The style costs 3,000,000 Beli and you must meet the Mastery requirements before he will agree to teach it to you.

The requirements for Superhuman

You need 300 Mastery or higher on all four V1 fighting styles:

V1 Style	Required Mastery
Dark Step	300
Electric	300
Water Kung Fu	300
Dragon Breath	300

Once all four are validated, he offers you the purchase. The purchase is permanent: you can switch to another style and then come back to talk to him to relearn Superhuman without paying again.

Leveling up to 300 Mastery faster

Server hop on the Smoke Admiral or the Awakened Ice Admiral: killing them by switching servers is the fast and simple method recommended by the source.
AFK farm with an auto clicker: it works, but do it on a private server, otherwise you'll get killed while you're away.

What he tells you

Quote	When
« You're not strong enough yet. Keep practicing your martial arts! »	If you haven't met all the requirements yet
« Would you like to learn the Superhuman fighting style for 3,000,000? This style allows you to destroy your opponent's body with powerful attacks and has special skills. »	If you meet all the requirements
« [Superhuman learned.] »	Once the purchase is complete