The One-Hit Wonder is a Superior unique weapon featured in Dead Island 2 (2023).
Here you can find the main information about the weapon and where to find it.
How to get the One-Hit Wonder weapon in Dead Island 2:
To unlock the One-Hit Wonder in Dead Island 2 you need to purchase the Golden Weapons Pack DLC, which is included in the Deluxe and Gold editions of Dead Island 2.
Once in the game, you can claim the Golden Weapons Pack at the Trader, where you'll be able to buy the weapons for free.