Terra Mystica: Fire & Ice
Buy this firstBGG rates it 8.4 from about 4,600 ratings. Many Reddit commenters pick it first; one says its turn-order track 'transforms the game from good to great'. The auction suits experienced players.
Needs: Just the base game
Adds: Six new factions, a new map, four new final-scoring tiles, a turn-order track and an optional faction auction.
Fixes: Eases the strong-faction problem: the new map and faction auction help balance, and the final-scoring tiles make where you build matter more.