Levels: Weapon levels are driven by investment in the Hamon attribute and improve to 6 - however, the only improvement to weapon stats is durability.
Manage your footing and timing and you'll become the Hamon master you always wanted to be! it has a long cooldown at low levels and may be difficult to continue striking from the crouching-to-standing form.
The goal of the Hamon class is to build up bonus stats by alternating left and right strikes and then cash those in for your ultimate ability, the Hamon Sunlight Overdrive, which reduces your combo amount to 0 and makes your next strike a 1-shot kill.