Remember if you want a specific creature to look here if it's available at this point or not, it will get regularly updated.
Lime presents the creature is available in the RPG, while red obviously presents the opposite. Orange is used for Undead when a Keeper has the proper Room requirements but lacks the additional required resources. Grey stands for unknown at this point.
Note: Most images were made by Tod, an artist from the French DK site Dk.net so the credits of these images go to him. If you want to use these images, you are obliged to add his name!
Creatures
Goblin

Code:
Requirements: None
Default Abilities:
Level 1: Attack
Level 6: Speed Self
Level 9: Protect Self
Available:
Northland: Yes
Red Crystal Islands: Yes
Faircoast: Yes
Frozengard: Yes
Fly

Code:
Requirements: None
Default Abilities:
Level 1: Attack
Level 3: Speed Self
Level 5: Sight
Level 8: Slow
Unique Ability: Can Fly
Available:
Northland: Yes
Red Crystal Islands: Yes
Faircoast: Yes
Frozengard: Yes
Firefly

Code:
Requirements: None
Default Abilities:
Level 1: Attack
Level 4: Slow
Level 6: Fireball
Level 7: Sight
Level 10: Protect Self
Unique Ability: Can Fly
Available:
Northland: Yes
Red Crystal Islands: Yes
Faircoast: Yes
Frozengard: Yes
Beetle

Code:
Requirements: Lair
Default Abilities:
Level 1: Attack
Level 4: Protect Self
Level 7: Freeze
Available:
Northland: Yes
Red Crystal Islands: Yes
Faircoast: Yes
Frozengard: Yes
Spider

Code:
Requirements: Hatchery
Default Abilities:
Level 1: Attack
Level 3: Web
Level 5: Freeze
Level 8: Hailstorm
Available:
Northland: Yes
Red Crystal Island: Yes
Faircoast: Yes
Frozengard: Yes
Warlock

Code:
Requirements: Library
Default Abilities:
Level 1: Attack
Level 2: Fireball
Level 3: Heal Other
Level 4: Meteor
Level 5: Invisibility
Level 6: Navigating Missile
Level 7: Sight (Passive)
Level 8: Whirlwind
Level 10: Word of Power
Available:
Northland: Yes
Red Crystal Islands: Yes
Faircoast: Yes
Frozengard: Yes
Troll

Code:
Requirements: Workshop
Default Abilities:
Level 1: Attack
Level 5: Speed Self
Level 7: Grenade
Available:
Northland: Yes
Red Crystal Islands: Yes
Faircoast: Yes
Frozengard: Yes
Orc

Code:
Requirements: Guard Room
Default Abilities:
Level 1: Attack
Level 4: Speed
Level 7: Protect Self
Level 9: Grenade
Available:
Northland: Yes
Red Crystal Islands: Yes
Faircoast: Yes
Frozengard: Yes
Dark Elf

Code:
Requirements: Guard Room
Default abilities:
Level 1: Attack
Level 1: Arrow
Level 4: Missile
Level 6: Guided Bolt
Level 7: Sight
Level 9: Protect Other
Available:
Northland: Yes
Red Crystal Islands: Yes
Faircoast: Yes
Frozengard: Yes
Bile Demon

Code:
Requirements: Hatchery + Workshop
Default Abilities:
Level 1: Attack
Level 2: Poison Cloud
Level 4: Fart
Level 7: Protect Self
Unique Ability: Immune to Gas
Available:
Northland: Yes
Red Crystal Islands: Yes
Faircoast: Yes
Frozengard: Yes
Salamander

Code:
Requirements: Training Room and Lava Presence
Default Abilities:
Level 1: Attack
Level 2: Fire Spit
Level 4: Fireball
Level 6: Speed Self
Level 7: Meteor
Unique Ability: Immune to Lava
Available:
Northland: Yes
Red Crystal Islands: No
Faircoast: Yes
Frozengard: Yes
Demon Spawn

Code:
Requirements: Training Room
Default Abilities:
Level 1: Attack
Level 4: Fireball
Level 7: Heal Self
Level 10: Protect Self
Unique Abilities: Immune to Lava, At level 10 Is allowed to Transform into a Level 1 Elite Dragon
Available:
Northland: Yes
Red Crystal Islands: Yes
Faircoast: Yes
Frozengard: Yes
Dragon

Code:
Requirements: Once a Demon Spawn reaches Level 10 or Beyond (Elite).
Default Abilities:
Level 1: Flame Breath
Level 1: Attack
Level 2: Heal Self
Level 4: Fireball
Level 7: Meteor
Level 9: Protect Self
Level 10: Word of Power
Unique Abilities: Immune to Lava, Can also use the ''Flame Breath'' as a subsitute to ''Attack''
Skeleton

Code:
Requirements: A Humanoid Prisoner Dies while in Captivity
Default Abilities:
Level 1: Attack
Level 5: Protect Self
Level 10: Lightning
Unique ability: Doesn't Need Food, Immune to Gas
Available:
Northland: No Humanoid Prisoners
Red Crystal Islands: No
Faircoast: No
Frozengard: No Humanoid Prisoners
Ghost

Code:
Requirements: A Prisoner Dies while under Torture
Default Abilities:
Level 1: Attack
Level 2: Invisibility
Level 4: Rebound
Level 6: Drain
Level 8: Freeze
Unique Abilities: Can Pass Through Locked Doors, Immune to Gas, Doesn't Need Food, Can Fly
Available:
Northland: No Prisoners being Tortured
Red Crystal Islands: No
Faircoast: No
Frozengard: No
Rogue

Code:
Requirements: Casino
Default Abilities:
Level 1: Attack
Level 4: Speed Self
Level 5: Invisibility
Available:
Northland: Yes
Red Crystal Islands: No
Faircoast: Yes
Frozengard: No
Dark Mistress

Code:
Requirements: Torture Chamber
Default Abilities:
Level 1: Attack
Level 5: Lightning
Level 7: Speed Self
Level 9: Drain
Level 10: Freeze
Available:
Northland: Yes
Red Crystal Islands: No
Faircoast: No
Frozengard: No
Tentacle

Code:
Requirements: Temple and Water Presence
Default Abilities:
Level 1: Attack
Level 3: Freeze
Level 5: Hailstorm
Level 8: Protect Self
Unique Ability: Moves *much* Faster in Water
Available:
Northland: Yes
Red Crystal Islands: No
Faircoast: No
Frozengard: No
Hell Hound

Code:
Requirements: Scavenger Room
Default Abilities:
Level 1: Attack
Level 3: Speed Self
Level 5: Flame Breath
Level 7: Sight
Unique Ability: Immune to Lava
Available:
Northland: No
Red Crystal Islands: No
Faircoast: Yes
Frozengard: No
Vampire

Code:
Requirements: 5 Rotting Corpses on the Graveyard
Default Abilities:
Level 1: Attack
Level 2: Flight
Level 3: Slow
Level 4: Drain
Level 5: Heal Self
Level 6: Teleport
Level 7: Protect Self
Level 9: Whirlwind
Level 10 Freeze
Unique Abilities: Cannot Cross Water, Resurrects when Dying if beyond Level 2 Except when Fighting Versus Monks, Fairies, or Priestesses. Experience Drops to 0 When Resurrecting. If a Vampire has Less than Half Experience to Reach his Next Level, he Drops a Full Level. (Experience Remains Intact Based off of Percentage of Its Progress to the Next Level)
Level Drops Do Cause a Spell Loss if Dropped Beneath the Level it was Learned
Available:
Northland: Yes
Red Crystal Islands: No
Faircoast: No
Frozengard: No
Black Knight

Code:
Requirements: Combat Pit
Default Abilities:
Level 1: Attack
Level 4: Protect Self
Level 10: Rebound
Available:
Northland: Yes
Red Crystal Islands: Yes
Faircoast: No
Frozengard: No
Maiden of the Nest

Code:
Requirement: Library and Temple
Default Abilities:
Level 1: Attack
Level 1: Poison
Level 3: Web
Level 5: Slow
Level 7: Fear
Unique Traits:
Immune to All Negative Status Effects, Immune to Web
Characteristics:
A mutation between a human female and a spider, creating a rather unattractive and fearsome Creature. The Maiden is a slow but powerful woman, possessing poisonous magic that is feared by even the strongest of Creatures. Although large, the Maiden's flesh generally lacks toughness, making her a bit easier to kill. However, her immunity to negative status effects gives her a unique Strength in battle as a trade off.
Available:
Northland: Yes
Red Crystal Islands: No
Faircoast: No
Frozengard: No
Dark Angel

Code:
Requirement: Temple, Scavenger Room, Sacrificed Creatures with a Total Level of At Least 5
Default Abilities:
Level 1: Attack
Level 3: Flight
Level 4: Meteor
Level 5: Lightning
Level 6: Disruption
Level 7: Thunderstorm
Level 10: Word of Power
Unique Traits:
Can Use Two High Power Spells, Negates Protect (Both on Him and Enemies), Negates Invulnerability (On Self)
Characteristics:
The Dark Angel is a mighty and feared Creature that has been summoned from the heavens. He possesses tremendously powerful offensive strength, both physical and magical. With this power, he can pierce enemy lines with ease. Powerful defensive Creatures such as the Bile Demon and Dragon are nothing to him. Not even the Protect Spell can stop such a powerhouse. However, he does have one fatal weakness, and that is his own lack of defense. Although mighty and proud, the Dark Angels must be cautious when charging straight into battle for they can find themselves easily slain by enemy blades and magic.
Available:
Northland: Yes
Red Crystal Islands: No
Faircoast: No
Frozengard: No
Horned Reaper

Code:
Requirement: Temple, Combat Pit, Sacrificed Creatures with a Total Level of At Least 5
Default Abilities:
Level 1: Attack
Unique Traits:
Vulnerable to Magical Damage, Negates All Status Effects, Resistant to Stunning, Cannot be Picked Up, Can Walk on Lava
Characteristics:
The furious beast known as the Horned Reaper is a widely feared demon that has risen from hell. They're fast and powerful, with raw offensive power greater than that of a Dark Angel, if only barely. They are rumored to be unbeatable, but that is fortunately just a rumor. The Horned Reaper is noticeably weak in terms of defense. They're fast, but this is due to their own lack of armor. They lack any sort of Magic, and are vulnerable to Magic in general. They cannot be buffed, but at the same time, they cannot be debuffed. They're bold and reckless Creatures, which can save them if it intimidates an enemy enough, but also can be the most common cause of death if it doesn't.
Available:
Northland: Yes
Red Crystal Islands: No
Faircoast: No
Frozengard: No
Lesser Skeleton

Code:
Requirements: Summoned by the "Summon Skeleton" Spell
Default Abilities:
Level 1: Attack
Characteristics:
A summonable Skeleton that is generally weaker than a standard Skeleton. His offensive strength remains about the same, a bit weaker but it is barely noticable. He severely lacks any defensive power compared to the Skeleton, however. They also are typically lacking when it comes to Spells, even for Skeleton standards, but they do occasionally sacrifice even more of their Strength for a Spell or two.
Unique ability: Doesn't Need Sleep/Food/Pay, Immune to Gas, Can Only be Controlled by the Summoner