Dungeon Keeper (New Game+) - Level 14 - Sleepiburgh

I took me few attemps to get idea how to win this level. I was confused by getting so many Warclocks at first as enemy keepers kept getting Bile demons which were much better. But reason for Warlocks was using them in Library to research Torture Room to attract Mistresses. I had like 10 of them and later also Horned reaper when i inprisoned some Bile Demons from Green Keeper. It was quite time consuming level but I wanted to be sure to win the fights. I could probably get Tranfer creature but I did realize where it is at the end of level so it was too late because I lost my ability to build Bridge. I wonder how much Will be Horned Reaper missed in next level. I remember its difficult one.