If you are with the alliance, you get the final quest (save our people) on the map with the alliance symbol right next to the final cave where you got the 4th heartpiece. To complete the quest, go southeast, in a map with no symbol, right under an archer symbol. You'll see Shadow lord Xin and must kill him. He is quite hard if you let him get close to you. I recommend the frequest use of frostbite for mages. ( You can only get the final quest once you have obtained the heartstone in the 4th city)
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