Kavaxas's History
Kavaxas, aka Hot Head, is an enemy of the Ninja Turtles. As a the lord of the Demodragons and ruler of the Netherworld, he is one of the most powerful Demodragons of all from the Netherworld. With abilities such as pyrokinesis, necromancy, power absorption, and soul absorption, he has proven to be one of the most deadliest villains that the Ninja Turtles and his allies had to face (even more deadlier than Super Shredder in fact). Originally he was summoned by Tiger Claw through the aid of The Scroll of the Demodragon, so that the demon could resurrect the recently deceased master of The Foot Clan, The Shredder. As soon as The Shredder was resurrection and the two other deeds to his liberation were accomplished, he gained enough power in order for him to potentially take over the 10 dimensions, as he unleashed a Netherworld Invasion all over the streets of New York City. But once the Mystic Seal of the Ancients was fixed by Michelangelo and was able to command the demon for his own purposes, he ends up back to the Netherworld alongside Undead Shredder. He wields a Demodragon Staff as his signature weapon of choice. He has a rivalry with Tiger Claw. Kavaxas debuts in Scroll of the Demodragon.
History
Kavaxas belongs to a race known as the Demodragons, a kind of demon that has been evoked by evil wizards in the past to bring about disaster to the world. Kavaxas is described as the most powerful of his kind and their current lord.
In the 21st century, after the Shredder had fallen by the hand of the Turtles, his faithful followers, alongside Tiger Claw, discovered a group of creatures whom were faithful to the cause of the Shredder, and formed with them a demonic cult in order to summon Kavaxas to the Earth. Tiger Claw's goal was to use Kavaxas' powers to bring his master back to life. Using an ancient scroll, the Scroll of the Demodragon, and the Seal of the Ancients, Tiger Claw summoned Kavaxas who was angry at a mortal summoning him. Upon being attacked by him in outrage, Tiger Claw shielded himself with the seal; seeing Tiger Claw's possession of the amulet, he complimented him for being "wiser than [he] thought", and reluctantly complied with his orders.
However, Kavaxas secretly pursued his own agenda in which his existence on the Earth benefited him greatly. Namely, he had intended to open up a connection between the Earth and the Netherworld and thereby take dominion over the human world.
To that end, he cooperated with Tiger Claw, whom had brought him the Kuro Kabuto and the heart of the Shredder, both of which were needed for his resurrection of the Shredder. In addition to Shredder, he also revived Rahzar (whom had been killed in a confrontation with the Turtles by Leatherhead) but as undead beings, thereby making them slaves to his will. With his control over Shredder, Kavaxas managed to trick Tiger Claw and succeed in breaking the mystic seal, thus ensuring that he could tear open a gate to the underworld without hindrance and purging the Earth into destruction. However, the Turtles, April O'Neil, Casey Jones, Karai, Splinter’s Ghost, and Leatherhead interfered in his plan and with a portion of gum, Michelangelo succeeded in repairing the seal, thus reversing the invasion, and once again, banishing Kavaxas into the Netherworld with Shredder and Rahzar going with him.
Following Kavaxas’ defeat, the Turtles destroy the seal and spread its remains towards the ocean in order to make sure that he doesn’t return.
