There is a notable spike in difficulty from Demons to Liches. My heroes are all over 1100 and they get killed pretty often. Using 3 Longbowmen and 2 High Priestesses. Abomination was rather easy though.
Whenever I log out, the monsters in the Forest are reset to Drakes. Which means an enormous loss of offline Exp compared to Giant Drakes or Hellhounds.
Each liquid corresponds to certain lines, either horizontal, vertical or diagonal. Also if you are colour blind, on the painting puzzle, each section will fill out automatically after about 50% of it has been painted if you are using the right colour. Takes some try-and-error though.
To be honest, it is revealed.
It is shown in a secret panel somewhere inside the game.
But, if you want, we'll tell you it here and now.
Faust is DAPHNE!
TADAAAAAAAAAAAAAAAAAAN!
SPOILER: No, she isn't.
Lich special ability was way overtuned and doing insane damage, it's being scaled down a lot for next patch