How to get Waterwheel Weapon Treasure? Get All Treasure: How to get Luiza’s Heirloom/Treasure? How to get Donna Benevento‘s Treasure? How to find Maestro’s Collection/Treasure? How to get Waterwheel Weapon Treasure? How to get Moreau’s Hidden Weapon/Treasure? How to get the Riverbank Treasure? How to get Cannibal’s Plunder/Treasure How to get Treasure Under The Stronghold? After defeating House Benevento, head to the location in the screenshot. Open the door with “Iron Insignia key” Pick up “Waterwheel weapon “- “GM79”