Played the game for a while now and now my first enthusiasm is fading. I have finshed most of the beginner quests and now there is a HUGE jump in the time investment of quests, e.g. reach building lvl 8 (from lvl 4) for basically every building which should take a while and it seems the rewards aren't even worth it. And there are definately not enough daily quests. Let's see how the game develops once the fighting starts.
I believe I finally understand the evolution tree, e.g. take Demon Mages:
Young Vampire -> Vampire Serve -> Vampire
Necromantic -> Wolf Mage -> Death
You cannnot evolve a Vampire or Death with the Undead Lord, but you can evolve Death with a Vampire or viceversa to get an Undead Lord.
It's the same with Nature Corruptor and Fallen Angel who evolve when combined into a Lich King.
And combining Lich King and Undead Lord gives you a Balrog.
In the same way you can combine the creatures on the other pages.
So the maximum evolution chain length is 5, e.g. Dark Cleric (+Demon Cleric ) -> improved Demon Cleric (+Fallen Angel) -> improved Fallen Angel (+Nature Corruptor) -> improved Lich King (+Undead Lord) -> improved Balrog.