Obsidian Chunk

A rare melee weapon with 9 uses that gains +2 damage every time it's swung. It starts weak at 1 damage, but by the ninth strike it hits for 19. The bonus damage persists across battles within a run but resets at the end of the adventure. Part of the Obelisk set. Equip it early and use it consistently to snowball into a late-run powerhouse.