Berserk Turrets appear as red shadows in the second and third sections of Antenora within the Abyss of Time. They will be in a group of five small tanks when encountered. They can also be hard to damage with attacks to both their weakness and the elements they don't have a defense against, even from party members that have a much higher level than them. The party can either elect to use multi-target Elec, Ice, and Wind skills to damage them or try to focus on one at a time to knock them out of the fight.
The Berserk Turret is found on Path 6 of Yomotsu Hirasaka within the Midnight Channel. They will generally use Mind Charge before attacking. After being defeated, it may drop Bull's-Eye Shot. Selling 10 Bull's-Eye Shot at the TV extension of Daidara will unlock the Judge of Hell handgun for Naoto Shirogane.