|Died||21 May 3015|
Nikolai Mason was the commanding officer of Nik's Cavaliers mercenary command.
Nikolai would be killed when mercenary unit known as Black Inferno combat dropped onto the Cavaliers' base on De Berry Prime. In the course of the campaign, the commander would discover that Nikolai arrived in the Inner Sphere in the late 30th century from somewhere outside of the Periphery. Players have made the conclusion that he was part of Intelser, the Clan operation that gathered the first intelligence for the Clan Grand Council circa 2980.
During his journey to the Inner Sphere, Nikolai piloted a pristine Star League Defense Force vintage NSR-9J Nightstar which upon recognizing was out of place in the LosTech depleted Succession Wars era was carefully hidden on HD-389202.
At the time of his death Nikolai was piloting a Victor. His Victor was salvaged by the Black Inferno following his death and taken to their repair and refit base on Eaton, with his son defeating Inferno member Zavarov to reclaim the 'Mech. Cavalier chief tech Fahad Arazad would discover that the coordinates sought by the Black Inferno, were hidden heavily encrypted in the 'Mech's computer system.  Nikolai also rigged the Victor with a transponder that would react and could command the 'Mech bay containing his Nightstar to activate and open.
- Audiolog Identification Number Alpha-Charlie-7-7-1-8-Victor-Romer dated 2990 that contained three sets of coodinates.
- "MechWarrior 5: Mercenaries", "Campaign Mission 1 - Tutorial"
- Knives in the Dark
- "MechWarrior 5: Mercenaries", "Campaign Mission 20 - Reckoning"
- "MechWarrior 5: Mercenaries", "Campaign Mission 12 - Black Harvest"
- "MechWarrior 5: Mercenaries", Black Harvest