Demonic Library
The arch-wizards of the old desert empire played with hellfire, and their entire civilisation suffered for it. Now malevolent beings seek to bring forth a world-destroying force.
Demonic Library is a Vicious-level dungeon located far to the North. It is unlocked by defeating Shifting Passages. The map consists of the main (library) part, as well as a special subdungeon hosting the boss of the dungeon (arena).
Contents
Overview
Monsters
Imp: Blinks
Succubus: Weakening Blow, Death Gaze 50%
Djinn: Magical Attack, Retaliate: Fireball
Doom Armour: Berserks 50%, Death Protection 1/Level
Cultist: Cowardly, Respawns (into: one level lower 
Zombie: Undead, Bloodless )
Thrall: Undead, Bloodless, Poison, Mana Burn
Steel Golem: Curse Bearer, Physical Resist 25%
Monster difficulty is 140%, 100% in the Avatar's floor.
Bosses
The boss is The Avatar (
Animated Armour icon, Attack 75, Health 954, Physical Resist 25%, Magical Resist 75%, Berserks 25%). However, in order to enter the Arena under the library where the Avatar resides, the five Demon Lords must normally be defeated:
Perivolcan Ze: Attack 105, Health 222, Magic Resist 50%, Corrosive; found in the top left corner of the map
Perivolcan Pa: Attack 105, Health 222, Physical Resist 50%, Weakening Blow; found in the top right corner of the map
Mesostel Pa: Attack 105, Health 222, Curse Bearer, Mana Burn, Deathgaze 100%; found at the right side of the map
Aphelion: Attack 105, Health 222, First Strike, Poisonous, Magical Attack; found at the very bottom of the map
Mesostel Ze: Attack 105, Health 222, Magical Attack, Retaliate: Fireball; found at the left side of the map
The Demon Lords each have identical stats, but different traits.
Special Rules
Defeating any Demonlord will give one layer of Death Protection to another one (chosen randomly). Defeating all five Demon Lords will remove all unbreakable walls from the map, thus unlocking the central entrance to the circular arena where the Avatar resides.
Striking the Avatar in melee or via BURNDAYRAZ produces several level 10 "???" enemies, with random palette swaps and abilities. PISORFing the Avatar does not produce ???s. ???s are not no-experience enemies, and easier ???s can be killed to level up if you need.
Strategy
Recommended Classes/Races
Recommended Classes: 
Paladin, 
Warlord, 
Bloodmage, 
Thief, 
Crusader or 
Tinker.
Recommended Races: 
Orc, 
Gnome, 
Halfling.
Because the Demon Lords have various traits, most strategies will find at least some of them more difficult to defeat. Generalist classes like the Thief or Tinker will benefit from their versatility; Paladins will have an easier time defeating the Avatar; Warlords have an easier time defeating the Demon Lords; and Bloodmages can tap into the blackspace of the Library Walls and fully benefit from the sizeable blackspace of the Arena itself. Although Crusaders will get limited use of 
MOMENTUM because of the number of bosses (although, a little well-timed momentum can help dispose of a problem Demon Lord quickly), 
SCARS will help provide more targets for leveling and help with two of the Demon Lords. Not worrying about curses means that they'll always be able to use the resistances from prepping 
Dragon Shield and 
Patches the Teddy, which will help with getting an early start on the Demon Lords with their 105 damage attacks and staying power against the Avatar at the end.
In terms of races, because of the need to spike potentially multiple bosses, the potion races generally fare well. Orc does well because of the decent early-game damage boost that helps against the non-trivial monsters occupying the map.
Fighting the Demon Lords
Because each dying Demon Lord will give a layer of Death Protection to one of the remaining Demon Lords, leaving the most difficult lords for last might prove to be counter-productive. It is generally a good idea to start with one or two easier demon lord, but then take on the most difficult one after them, timing level-ups and using up some of the potions / other resources to defeat him.
It's a good start to kill a boss around L5-6. Take care of your exp bar and use level catapults properly. Generally, caster starting can spike Perivolcan Pa (top right corner) with level catapults and mana potions. The exp bonus is sizable, and it helps you level very fast.
Because you want to kill the Demon Lords at low level, regen-fight is generally out of the consideration and damage spike needs a level catapult and often consumes some more resources. An early 
Orb of Zot bomb makes the fight considerably easier.
Fighting The Avatar
Before engaging The Avatar in the bossfight, it can be beneficial to move him right next to the stairs using teleportation magic or PISORF. Otherwise the minions that spawn when he is struck will clog the whole map, making the stairs back to the surface inaccessible. Having him right next to the stairs leaves access to the resources (altars, shops, monsters, blood pools) within the library itself.
This alone makes Binlor a good diety to worship. Having knockback or PISORF will ensure you to move the Avatar next to the stairs, and positioning one ??? behind him will allow additional knockback damage. Binlor also poses a method for eroding the Avatar's 25% physical resistances.
Fighting the ???s
Advanced players can leverage spawned ???s to their advantages. Hitting The Avater with a melee attack, 
BURNDAYRAZ (but not 
PISORF!), or popping its 
Burning stack will spawn several ???s on the arena floor. They are all level 10 with different stats.
- Random damage
- Random health
- 50%
Magic resist or 50% 
Physical resist -
Bloodless or not
The important thing is they ARE XP-valuable. Because some ???s would be quite weak and there is a large chunk of blackspace in the arena, the player can level-up or at least prepare a levelup catapult for fighting The Avatar. If you have knockback, you can ensure that you are not cut from the main floor while spawning some ???s.
Trivia
According to an experiment, though it is actually possible to snipe The Avatar without defeating any Demon Lord, all Demon Lords should be defeated to win the dungeon.
Quests
Requires Enhanced Edition: The Moving of the Cheese - Complete Demonic Library with any 3 classes. Unlocks the playable 
Rat Monarch monster class. The Avatar drops the 
Avatar's Codex.
