MechWarrior 5: Mercenaries - Solaris Showdown

Summary pulled directly from Steam - Some text may only be applicable to Steam platform

SOLARIS SHOWDOWN
Fresh off a successful mission for the notorious Mercenary Star, Mason and crew journey to the Hardcore system where they collide with 'Mech pilot Duncan Fisher embarking on a quest to secure a spot in the FedCom Unification Tournament. Forming an unlikely alliance, Mason and Fisher traverse the shadows of Solaris, engage in harrowing 'Mech duels, and race against the clock to save the day - a true Solaris Showdown.

Join Duncan Fisher in a race against time to thwart the overthrow of the Solaris Council, discover the new Loader King 'Mech, collect 11 new Gladiator 'Mech variants, select new weapons and equipment tailored for close-quarter engagements, and help save the very future of Solaris

Assist Duncan Fisher on his zany adventures, and witness his ascension as the official and iconic Voice of Solaris
Seek fortune and Fame with new Arena Missions and reward system
Solaris Showdown adds the new Loader King 'Mech chassis with 6 variants, including the mighty Hero LDK-IDM 'Indomitable'
Collect 11 new 'Mech variants designed specifically for the intense Gladiator-style combat of the BattleMech arenas
Select from an array of new Gladiator-style weaponry and equipment
Enhancements to MechLab, AI Improvements, and various other free QoL updates