HAPPY NEW YEAR TO ALL OF YOU!!
Btw, we have released long-awaited Demon Pact update! Several players asked for a way to recruit Demon units and we implemented it ^^
After you unlock Demon City, wait for a while and the Conclave Representative will visit you (just after midnight). Your heroes might sign the Demon Pact which will allow Demons to be recruited. But, as always with this kind of deals, there is a price...
All of best,
Les & AOF Team