From the back of the book:
THE STAR LEAGUE STRIKES BACK!
The brave warriors of Task Force Serpent secretly made the thousand-light-year journey to the Smoke Jaguar home world of Huntress to eliminate the last of the Clan's holdings. What they find there will test the limits of their skills, their endurance and their loyalty.
Twilight of the Clans is a BattleTech scenario pack that picks up where the Dragon Roars left off, as the campign to end the Clan invasion reaches its stunning climax! Players can take the part of the Star League or the defending Clans in a series of ten BattleTech scenarios, and even accept the challenge of commanding the entire assault on Huntress in a detailed BattleForce 2 campaign.
User comment:
This BattleTech scenario pack forms the second volume in the series charting the end of the war between the Clans and the Inner Sphere, and follows on from the earlier BattleTech scenario "The Dragon Roars." While this scenario pack doesn't add any new rules or equipment, it does incorporate a wide range of units including ProtoMechs and OmniFighters, and includes detail on BattleForce 2 campaigns, a relative rarity in BattleTech scenarios.
Although this scenario pack is now out of print, it's available as an electronic download from the current license holder.