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Traders & Barbarians is distributed as the third major expansion for The Settlers of Catan, although it is actually a compilation of small expansions and variants. (It is independent of the Seafarers and Cities & Knights expansions, but can be combined with them.)
This compilation includes 5 scenarios:
It also includes 4 variants:
In Barbarian Invasion, barbarians are invading Catan and the players have to try to stop them with new knight pieces. This plays very similarly to the flood mechanic in the Atlantis scenario from the Atlantis and Das Buch scenario packs.
In Traders & Barbarians, you get new hexes, one for the castle, one to produce glass, and one to produce marble. You try to rebuild Catan after the invasion. You get gold and victory points if you finish tasks in the castle, but to do so you have to travel back and forth to the castle on roads and undeveloped paths. There are still some barbarians around who interfere with trade routes.