Writhing Bone Ghouls are frightening creatures. With arms that curve into blades and a spiked skull, just its appearance has caused creatures to run away in horror. They are known for their aggression, attacking creatures of all sizes. Their incredible ferocity is so renowned that they have even managed to attract The Choten's attention for his experiments. There's no telling what devious plan he might use it for. The Choten tested his evolution serum on many different creatures. Writhing Bone Ghoul evolved into a significantly more dangerous form — Impalicus after The Choten used him in an experiment.
In A Light in the Darkness, a Writhing Bone Ghoul is summoned by Alakshmi Verma as she tries to control him. The Choten has Aqua Seneschal fire a dart containing the Evolution Serum at Writhing Bone Ghoul. Deeming Alakshmi unable to use the evolved Bone Ghoul, the Choten assigns Fingers to use in order to attack Raiden Pierce-Okamoto. Fingers attacks Gabriel Wallace at an abandoned amusement park in order to draw Raiden to him. The evolved Bone Ghoul defeated Tatsurion the Unchained, but was defeated by Sasha, Channeler of Light. The Choten ends up having Fingers thrown into the portal to the Darkness Civilization to look for the evolved Bone Ghoul since he is probably far away from where he was last summoned by now.
In Darkness of Heart, the evolved Bone Ghoul now named Impalicus is seen under Megaria's possession with Fingers as her prisoner. During Raiden's mission to rescue Allison Underhill from Megaria, Alakshmi and Fingers were able to escape with Impalicus and the Cloak of Dark Illusion in their possession.
In Bargain, the Choten tests his antidote for the Evolution Serum on Impalicus regressing him back to a normal Writhing Bone Ghoul.
In Siege, Fingers uses the un-evolved Impalicus to fight Raiden, Gabriel, Allison, Lucy, and Alakshmi when they raid The Choten's ship. When the Evo-Serum Bomb is detonated in the Null Zone, Impalicus is among the creatures exposed to it and evolves once more.
Master Chavez | Gilaflame the Assaulter
Master Kimora | Mighty Shouter
Master Nadia | Aqua Chaser, Rusalka
Master Isao | Prism-Blade Enforcer
Master Jaha | Black Feather of Shadow Abyss
Original Duel Masters
Alcadeus, Winged Justice ● Argus, Vigilant Seer ● Beliqua the Ascender ● Blinder Beetle ● Citadel Magistrate ● Cobalt, the Storm Knight ● Cyborg Samurai ● Flare Inhibitor ● Halon ● Kolus, Soulshine Enforcer ● Lars, Virtuous Imager ● Luminar ● Nimbus Scout ● Orion, Radiant Fury ● Rain-Cloud Kraken ● Razorpine Tree ● Rodi Gale, Night Guardian ● Sentrus ● Shaw K'Naw ● Spyweb Scurrier ● Stalker Sphere ● Starlight Strategist ● Star Lantern ● Sun-Stalk Seed ● Urth, the Overlord
Aeropica ● Angler Cluster Hartl ● Aqua-Ranger Commander ● Aqua-Reflector Nomulos ● Aqua Rider ● Aqua Seneschal ● Aqua Surfer Fertil ● Aqua Trickster ● Bladefish ● Buoyant Blowfish ● Captain Orwellia ● Cyber Lord Corile ● Finbarr's Dreadnought ● Fluorogill Manta ● Hazard Crawler ● Hydro Initiate ● Hydro Spy ● Hydrobot Crab ● King Bullfang ● King Coral ● King Poseidon ● Knowledge Warden ● Man o' Warden ● Memory Swarm ● Midnight Crawler ● Mother Virus ● Rapids Lurker, Wwhhshrll ● Saucer-Head Shark ● Snapping Eel ● Steam Star Grapplog ● Vikorakas
Council of Logos
Finbarr ● Hokira ● Milporo
Arachnoir of Cobweb Cavern ● Armored Guard ● Dagger Doll ● Delisle-la of No Return ● Dream Pirate ● Drooling Worm ● Gaunt Boneweaver ● Ghost Spy ● Gigargon ● Gigabolver ● Gigastand ● Gigazanda ● Gorgeon, Shadow of Gluttony ● Grave Worm ● Gregoria's Fortress ● Gregoria, Princess of Malevolence ● Locomotivator of Bleak Trestle ● Marrow Ooze ● Motorcycle Man ● Mr. Smiles ● Mudman Fumes ● Necrodragon of Vile Ichor ● Phosphorescent Ghost ● Ravenous Web-Leg ● Scavenging Chimera ● Skeeter Swarmer ● Skeleton Soldier ● Skull Cutter ● Slyth ● Spinning Terror ● Swampstench Worm ● Trixo of Wicked Wood ● Trox, General of Destruction ● Tygrif ● Venom Worm ● Vicious Coffer ● Wandering Brain-Eater
Assault Dragon ● Badlands Lizard ● Blade-Rush Wyvern ● Blastforge Marauder ● Blastforge Slavetrader ● Blaze Belcher ● Bolgash Dragon ● Bolshack Dragon ● Branca the Treacherous ● Burnclaw the Relentless ● Chaotic Skyterror ● Draglide the Swiftest ● Drakon Weaponsmith ● Explosive Infantry ● Flametropus ● Galsaur Rock Beast ● General Charzon ● Hammer Dragon Foulbyrn ● Hissy ● Jetflame Lizard ● Kenina the Igniter ● Lava Leaper ● Magma Dragon Melgars ● Meteosaur ● Moorna the Vengeful ● Napalmeon the Conquering ● Om Nom Nom ● Onslaughter Triceps ● Rothos the Destroyer ● Skycrusher ● Skycrusher's Elite ● Skycrusher's Volcano-Ship ● Sledge Bot ● Snaptongue Lizard ● Volcanodon the Whipcracker ● Vorg
Ambush Scorpion ● Brave Giant ● Broadsword Butterfly ● Dawn Giant ● Earthstomp Giant ● Essence Elf ● Fear Fang ● Forest Hornet ● Gasbag ● Granite Avenger ● Hornblade Dragon ● Jackalax ● Karate Carrot ● Launcher Locust ● Lumbering Elderwood ● Mana Tick ● Ninja Pumpkin ● Piercing Seer ● Raging Goliant ● Rapscallion ● Roaming Bloodmane ● Rumbling Terrasaur ● Scissor Scarab ● Shaman Broccoli ● Silver Fist ● Sniper Mosquito ● Splinterclaw Wasp ● Spore Siren ● Striding Hearthwood ● Steel Hammer ● Terradragon Regarion Doom ● The Great Arena ● Thorny Creeper ● Three-Eyed Dragonfly ● Transforming Totem ● Xeno Mantis
Bronze-Arm Champion ● Bronze-Arm Sabertooth ● Carnivorous Dahlia ● Chief Thorn-Bringer ● Copper Locust
Headstrong Wanderer ● Prickleback ● Razorhide