Class
A
Ci'th Stone Location
The Faultwarrens – The Sylphid Path
Mark
Tyrant
Mark Location
The Faultwarrens – Titan's Throne
Reward
7 Particle Accelerators
Secondary Reward
2 Crystal Oscillators
Unlock Condition
Complete Mission 43: The Hero Never Dies
This mark is a mere Tyrant, who you should have no problems with at all if you've made it to The Faultwarrens.