Get more projectiles every 20 levels (Max +3). Amount is doubled while invulnerable. Unlock: Survive while wearing the fully armed coat (DLC-only character).

Hammer specializes in invincibility synergy. The doubled Amount during invulnerability creates burst damage windows. Pair with arcanas and passives that grant invincibility frames (e.g., Arcana I Gemini) for maximum effect.

Build around RPG. Actively seek invincibility-granting arcanas and items. The longer and more frequent the invincibility frames, the higher Hammer's DPS ceiling.