Class
C
Ci'th Stone Location
The Faultwarrens – Primeval Crossroads
Mark
Amam
Mark Location
The Faultwarrens – A Dance of Shadow
Reward
Uraninite
Secondary Reward
6 Bomb Shells
Unlock Condition
Complete Mission 35: The Road Less Traveled
You'll fight a pair of Amams, and their ability to heal themselves can get pretty annoying. A sustained offense will take them out, but keep an eye on your HP.