Berserker is a Medal in Bug Fables. It increases an ally's attack by 3, but renders them unable to block, use skills/items, or turn relay.
Its effect, while powerful, significantly limits an ally's options. Since it only allows the use of an ally's default attack, it should be made sure that this attack can reach its target. The equipped bug can still participate in Team Skills as long as a different party member initiates it.
By heading east of the entrance to the Golden Settlement and using Leif's Bubble Shield to walk across the thorns, the Chomper Cave can be entered. Once inside, on the westernmost wall, there is a crack where Kabbu's Beetle Dig may be used, leading to the medal.