Seatroll submitted this

Build a prison and a torture room as soon as possible, for they'll
attract "Dark Misstresses", real powerfull monsters if trained well.

Build graveyards, your imps will take the bodies of your slain enemies
there and 1 of 10/15 will raise once again as a vampire !

In temples, sacrifice Imps, in 8 out ouf 10 cases the dark gods will
appriciate them!

If you already have build a prison, command your monsters to capture /
stun your enemies (select the '?' on the main dungeon screen and click
the prison icon), your imps will take them to prison, from there you can
transfer them to the torture room, to "convert" them to our evil course
;)

There must be "real" cheat codes in the game, found a section in the
*.exe, but couldn't figure out any codes ...

Stay tuned, more will follow, I'm heading back to Seatroll's Den, from
there back down to the dungeons ! ;)

Seatroll also found the first secret door.

Press here to gain knowledge of the whereabouts