Dead Island in the Bloodbath Arena DLC pack. According to the game developers, they had removed it in favor of several different weapon mods. Now the only current way to obtain this weapon is by modding the game save.The Sonic Pulse Grenade (previously "Brain Wave Bomb") is a ranged weapon that was supposed to be added to
It is also obtainable in Dead Island: Riptide as a buildable weapon.
Duct tape x2
Electronic Scrap x2
Large Battery x2