This is how you ask for help...
Deep Swamp: You need to play a mage tower class and have piercing wand (I recommend Bloodmage). Unless you find WEYTWUT you need to make sure you clear out one side of the map. Feel free to use those blood pools for hard fights as you can't reach them later. Get dracul as a god and if you are an elf make sure you have 24 mana for the boss (Gnome:18)
Use Blood curse before the boss for the extra piety and fireball damage.
As for Slime Pit with monk, since I don't want to type it all up again, just look at the thread Slime Pits is really Hard! (It might be Slime Pits is Really Cheap!)
Demonic Library: As you can tell this is my favorite dungeon so I'm glad to help! Be a human rogue with tri-sword, scout altar, magnet: fireball, and, if you have witch level 3, whupaz, quicksilver, and reflex potions. Immediately find CYDSTEPP or MA's altar ASAP. If you find MA use fireballs for 10 piety, get glyph magnet and CYDSTEPP, If you don't rinse & repeat till you do. Use CYDSTEPP to kill high level efreets and goats. When you can kill him in 3 shots, challenge Pervivolcan Ze. When you can kill them in 2 shots kill Maeostrel Pa and Aphelion. Last when you can kill them in 3 shots take out, Perivolcan Pa and Maeostrel Ze. If Dracul is there get him now convert all life into extra mana for the avatar. 25 is optimal. Go down the stairs. Immediatly quaff whupaz, reflex and Quicksilver for the first hit and the rest is up to CYDSTEPP. (Because it doesn't matter if Dracul gets mad when you have one hp). If you don't have the potions and this doesn't work hope for some lucky dodges. My first time I didn't have Dracul or the potions. This will take a lot of patience.
I speak chaos.