This question intrigued me. I found only two lists of illusionable creatures on the web. Lists can be found at tibia.fandom.com and tibiawiki.com.br. But have you ever wondered if these lists are correct and represent all known illusionable creatures? Maybe there are some unique monsters you can turn into? These questions did not give me peace of mind. Therefore, I decided to do my own research on the creature illusion spell.
First, I copied lists of monster names from various sources and then merged those lists into one. My list includes the names of regular monsters, bosses, boss minions, quest monsters, and even obsolete monsters. Based on the names of the creatures, I prepared ready-made spell incantations (Exactly as in the attached image below).
I decided to paste the prepared incantations one by one into the local chat and observe the results of the spell. For each spell, I recorded its result in the next column. The list created contains over 1600 records so it took a very long time. But it was very worth it because the final result of the research exceeded my expectations. First, I compared my results with lists from tibia.fandom.com and tibiawiki.com.br. I noticed that fansites incorrectly list some monsters as ones you can turn into with an illusion spell. Ogre Brute or Elite Pirat are examples.
Secondly, I managed to discover 35 illusionable monsters that are not listed on wikis. Some of them have unique sprites 
Take a look at the examples below for yourself.
Research has shown that the create illusion spell works more often on weaker monsters. You can only turn into a few bosses. Interestingly, the spell works on "Noble Pet of Chayenne" and on "Baby Pet of Chayenne" - monsters that theoretically should not be in the game anymore. Below I present a list of illusionable creatures that you will not find on wikis.
| Monster Name | Sprite |
| Arthom the Hunter |  |
| Baby Pet of Chayenne |  |
| Celebrating Orger |  |
| Cockroach |  |
| Dark Soul |  |
| Flame of Omrafir |  |
| Gnarlhound |  |
| Greater Death Minion |  |
| Hateful Soul |  |
| Hungry Brood |  |
| Irgix the Flimsy |  |
| Lesser Fire Devil |  |
| Mean Termite |  |
| Metal Gargoyle |  |
| Minotaur Bruiser |  |
| Minotaur Occultist |  |
| Minotaur Poacher |  |
| Muglex Clan Assassin |  |
| Muglex Clan Footman |  |
| Muglex Clan Scavenger |  |
| Noble Pet of Chayenne |  |
| Oodok Witchmaster |  |
| Orc Musician |  |
| Parasite |  |
| Rotspit |  |
| Sacred Snake |  |
| Sand Brood |  |
| Sandcrawler |  |
| Scar Tribe Shaman |  |
| Servant of Tentugly |  |
| Shadowstalker |  |
| Somewhat Beatable Dragon |  |
| Unbeatable Dragon |  |
| Vok the Freakish |  |
| Woodling |  |
There was nothing left for me to do but answer the question asked. Below is a current list of all illusionable creatures I have found during my research.
Abyssal Calamary
Aggressive Chicken
Agrestic Chicken
Amazon
Arthom the Hunter
Assassin
Baby Pet of Chayenne
Badger
Bandit
Bat
Bear
Black Cobra
Black Sheep
Blazing Fire Elemental
Blood Crab
Boar
Bog Frog
Bonelord
Brittle Skeleton
Bug
Butterfly
Calamary
Cat
Cave Rat
Celebrating Orger
Centipede
Charged Energy Elemental
Cheese Thief
Chicken
Chopper
Cobra
Cockroach
Corym Charlatan
Corym Skirmisher
Corym Vanguard
Cow
Crab
Crawler
Crazed Dwarf
Crocodile
Crypt Shambler
Crystal Wolf
Cyclops
Cyclops Drone
Cyclops Smith
Dark Monk
Dark Soul
Dawn Bat
Dawn Scorpion
Deepsea Blood Crab
Deer
Demon Skeleton
Desperate White Deer
Diamond Servant
Diamond Servant Replica
Dog
Dragon
Dragon Hatchling
Dragon Lord
Dragon Lord Hatchling
Dromedary
Dwarf
Dwarf Geomancer
Dwarf Guard
Dwarf Miner
Dwarf Soldier
Dworc Fleshhunter
Dworc Venomsniper
Dworc Voodoomaster
Earth Elemental
Ekatrix
Elder Bonelord
Elder Forest Fury
Elder Wyrm
Elephant
Elf
Elf Scout
Energy Elemental
Enraged Bookworm
Enraged Sand Brood
Enraged Soul
Enraged Squirrel
Enraged White Deer
Filth Toad
Fire Devil
Fire Elemental
Firestarter
Fish
Flame of Omrafir
Flamingo
Flimsy Lost Soul
Forest Fury
Fox
Freakish Lost Soul
Frost Dragon Hatchling
Frost Giantess
Frost Troll
Gargoyle
Gazer
Ghost
Ghost Wolf
Ghoul
Gloom Wolf
Gnarlhound
Goblin
Goblin Assassin
Goblin Leader
Goblin Scavenger
Golden Servant
Golden Servant Replica
Gozzler
Greater Death Minion
Green Frog
Grynch Clan Goblin
Hateful Soul
Holy Bog Frog
Honour Guard
Hungry Brood
Hunter
Husky
Hyaena
Hydra
Irgix the Flimsy
Iron Servant
Iron Servant Replica
Island Troll
Jellyfish
Juvenile Cyclops
Killer Caiman
Kongra
Ladybug
Lancer Beetle
Larva
Leaf Golem
Lesser Fire Devil
Lesser Swarmer
Lion
Little Corym Charlatan
Lizard Sentinel
Lizard Snakecharmer
Lizard Templar
Mad Technomancer
Manta Ray
Mean Lost Soul
Mean Termite
Merlkin
Metal Gargoyle
Minotaur
Minotaur Amazon
Minotaur Archer
Minotaur Bruiser
Minotaur Guard
Minotaur Mage
Minotaur Occultist
Minotaur Poacher
Monk
Monk of the Order
Muddy Earth Elemental
Muglex Clan Assassin
Muglex Clan Footman
Muglex Clan Scavenger
Mummy
Murderous Ghost
Museum Stone Golem
Mushroom Sniffer
Mutated Human
Mutated Tiger
Noble Lion
Noble Pet of Chayenne
Northern Pike
Novice of the Cult
Oodok Witchmaster
Orc
Orc Berserker
Orc Leader
Orc Musician
Orc Shaman
Orc Spearman
Orc Warrior
Panda
Parasite
Parrot
Party Skeleton
Penguin
Pig
Pirate Buccaneer
Pirate Corsair
Pirate Cutthroat
Pirate Ghost
Pirate Marauder
Pirate Skeleton
Poacher
Poison Spider
Polar Bear
Poodle
Priestess
Quara Constrictor
Quara Constrictor Scout
Quara Predator
Quara Predator Scout
Rabbit
Rat
Redeemed Soul
Renegade Quara Constrictor
Renegade Quara Predator
Rift Phantom
Roaring Lion
Roast Pork
Rotspit
Sacred Snake
Sand Brood
Sandcrawler
Scar Tribe Shaman
Scar Tribe Warrior
Scarab
Scorpion
Seagull
Servant of Tentugly
Shadowstalker
Shark
Sheep
Sibang
Silver Rabbit
Skeleton
Skeleton Warrior
Skunk
Slick Water Elemental
Slippery Northern Pike
Slug
Smuggler
Snake
Somewhat Beatable Dragon
Soul Spark
Spider
Spitter
Squirrel
Starving Wolf
Stone Golem
Swamp Troll
Swampling
Swarmer
Swarmer Hatchling
Tainted Soul
Tarantula
Tarnished Spirit
Terramite
Terror Bird
Thawing Dragon Lord
The First Dragon
The Hungerer
Thieving Squirrel
Thornback Tortoise
Thornfire Wolf
Tiger
Toad
Tortoise
Troll
Troll Champion
Troll Marauder
Unaz the Mean
Unbeatable Dragon
Undead Mine Worker
Undead Prospector
Valkyrie
Vampire
Vok the Freakish
Vortex Spawn
War Wolf
Wasp
Waspoid
Water Elemental
White Deer
Wild Warrior
Willi Wasp
Wilting Leaf Golem
Winter Wolf
Wisp
Witch
Wolf
Woodling
Worm Priestess
Wyrm
Wyvern
Zomba
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