By following Elvenar quests and reading through its story, one understands that the lands of the old world of Elvenar were once populated by many different races... It was a place of prosperity and knowledge, where development reached the most unimaginable peak! However, for reasons yet shrouded in mysteries and secrecy, all races but Elves and Humans disappeared.
With your efforts, research for new technologies and magic discoveries, your city has evolved and prospered and your citizens have become brilliant, wise and a bit magical too. As a result, they discovered a way to visit other dimensions, where the souls of the lost races are roaming, and figured out a way to revive them.
Knowing how to revive the souls of the lost races is not enough! You need to help them to gain shape and form so that they get fully recovered and established!
As the newly revived race is weak at first, it will need your help bringing their culture back to former glory. To be able to do that you will allow the coming race to build a settlement within your city and although the economy of that settlement is closely linked to your town it will have additional rules and thus new challenges.
But be at rest, they will leave their mark in your city - with new buildings, technologies and upgrades - so that you don't forget about them and you will always be remembered and proud of your accomplishments!
To be able to reach a new race you will first need to finish your own progress (the first one arrives in chapter VI). You will then need to build the gateway required for the race to come from the dimension, where their souls are roaming, into your city and connect it to your Main Hall. Finally you will need to connect their gateway to their own specific buildings using a special road. All those need to be researched in the Tech Tree.