Class
A
Ci'th Stone Location
The Faultwarrens – The Salamandrine Path
Mark
Zirnitra
Mark Location
The Faultwarrens – Titan's Throne
Reward
Gilgamesh, Inc.
Secondary Reward
10 Bomb Cores
Unlock Condition
Complete Mission 42: Antihero
This is a pretty standard fight against a lone Zirnitra. The reward is Gilgamesh, Inc., the final Retail Network, which sells a number of unique Weapons.