The Sin added 2 new towns, Trinity and Cadaverous.
In both of the city's you will find and Eldar whose spend his life on faith. Trinity with his Eldar is Devine and Cadaverous is Cthulu, they are twin faith towns and the civils hate civils from the other town, however they strangely have the same mission, they both have to kill a high Eldar and if you have reached a certain Faith level you will get more information about it, I'm not spoiling the mystery of the game so I won't give more information.
Some history, Trinity was build by Ganzig and Cadaverous by Valentine. The city's were made to be sister towns, but later, they parted from each other because of there different faiths.