Zul's Toy is a set of red hammers in Forever Kingdom. It is a non-elemental weapon, which can be equipped by Darius, Ruyan and Faeana.
It can be obtained in a chest in the Misty Cavern.
Zul's Toy one of the weapons shown in the early official screenshots released by From Software for Forever Kingdom, along with the Soltan Sword, the Seculian Sword, the Seculian Loops, and the Frying Pan.