Trainers at Swords and Brawler NPCs
Two confirmed trainers (Swords + Brawler) gate the M1 layers. You can learn more than one style. Pick whichever combo suits your Cursed Fruit — Swords scales well with Strength gear, Brawler pairs with stat-buff fruits.
Quest-Chain Upgrades
The first time you unlock Power Slash it is a regular slash. After completing the trainer quest the slash becomes bigger. Style skills scale via NPC quest chains, not level-ups.
Skill Scroll Drops
Some abilities drop from defeating Captain Marines and other NPCs (e.g., War Slash, Sword Lunge). The full named-scroll table lives in the in-game Logbook.
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