Mandibles of Doom is one of the quests you can undertake during your time on Monarch. The quest involves freeing Berthold Fox, held in Devil's Peak Caverns. This page of The Outer Worlds guide contains a walkthrough for this quest.
List of objectives
- Kill the Mantiqueen
- Talk to Berthold;
- Meet Berthold at the camp.
You can activate this task while making your way through Devil's Peak caverns. One of the caves is inhabited by a mantiqueen, that guards Berthold Fox who is standing on a cliff. Kill the beast and talk to the rescued man, and he will promise you a reward.
The reward can be picked up from a building located in C3 camp found nearby Devil's Peak Station. After you pick up the reward, talk to Berthold again, and the task will be completed.