Obsidian Pilum

It breaks after 3 hits, one for each point of its durability. Its hits do their damage and nothing more: they don’t stun, trip, weaken or burn, and barely shove. Charge your attack and you rush forward with it, hitting for 4 and stunning for 2s, and pinning whoever you run into. The Merchant sells it as Obsidian Pilum, for 40 coins.