In mission number 4 i built three libraries big enough to attract warlocks... All creatures needs are satisfied, i tried building them on a quiet place, deleted libraries and leave one and still no warlocks... Any info on that?

All you need to summon warlocks is a 3x3 library. If you do indeed have that, is it possible warlocks aren't coming through the portal because you've already reached your creature summon limit?

IIRC, correctly, mission number 4 is Flowerhat and on that map, you have a summon creature limit of 20. If you already have 20 creatures, it's time to throw some of those flies and beetles out of your dungeon to make room for warlocks

Don't wait too long before building a library though - it should be one of your first rooms and if you're not quick enough in building one the enemy keeper might claim all of the warlocks.

Holy crap, please watch your numbers. A 3x3 (9 tile) library is all that is needed. Not a library with 81 tiles.

Workshop, Training room (assuming gems or massively productive workshop), or Treasure Room (assuming gems), yeah 81 tiles for those rooms might be appropriate, but not a library.

You might get up to 50 tile libraries in the last levels, if you have lots of researchers and many spells/rooms to research.

Oops, thanks for pointing out that oversight. Post edited