Frost couldn't even remember his former name, but he could remember who he used to be on his previous life, a King and Knight, an honorable man that stood with his people and protected them until the bitter end. Until the Church of Light and the Holy Empire destroyed everything.
As he lost everything and then even his life, Frost's soul died with so many regrets that it stood within his Kingdom's ruins, even after thousands of years, even when the ruins were buried over and over again, and nothing else remained but an endless land of winter.
In that time, someone suddenly found him, eons later, his mourning soul was held by the cold hands of a young girl, who promised him that his unfulfilled promises and his powerful, undying conviction were what she needed.
"Become my loyal knight, and once the world is mine, I shall give you back the Kingdom you lost."
He couldn't simply reject such an offer. He had lost everything, there was nothing else for him left. He accepted immediately, and his very soul was placed inside the small body of an Ice Slime. Although it wasn't the human body he once had, it held incredible new capabilities, and as he was trained and leveled up in the Dungeon where his new master resided, his powers kept growing more and more.
Until now, when it was finally time to advance. United with others like him, who were abandoned and lost in the world, he decided to charge in and conquer the entire Continent of Midgard, and take away the things that once belonged to him, his Kingdom, and his people.
This conviction, even on his new aberrant form, would never fade away, the powerful and almighty will of a regretful king.
The entire Winter Kingdom crumbled apart, and then merged together with an endless mass of blue slime, shaping into a titan of ice, several times bigger than the Frost that Partner and Lucifer were fighting before.
This was his true form, a gigantic, hundreds of meters big Eternal Winter Slime, a powerful S Rank evolution of the lowly Ice Slime. Covered on an incredibly hard armor of ice in the shape of a humanoid titan with sharp armor and holding a gigantic axe and a divine shield, Frost confronted the two once more.
"The appearance of a slime is a rather unsightly one, don't you think?" Laughed Frost. "Especially for a King such as myself. But fine, now that I've been found out, there's no point in hiding anymore! Now, come!"
Lucifer and Partner were left flabbergasted that he had been tricking them this entire time. Frost true form was that of a slime hiding underground, while he used his amazing ice manipulating magic to create a fake scenario for them to tire themselves out.
Despite being an "honorable king" as he called himself to be, his tactics were cowardly and like something that Maria would come out with, as Lucifer and Partner thought.
"This damn bastard was trying to weaken us and tire us out, wasn't he?!" Partner sighed, gasping for air. Indeed, she had grown already very tired, and without any more blood for her to drink, she was only going to grow more tired.
"Hahhh… I should had used my Eye of Death Perception sooner." Lucifer regretted. "Drink my blood. I know you're tired."
Lucifer quickly cut off a small wound on his right hand's wrist, as a large quantity of red blood started flooding out like a waterfall.
"Eugh, there's no way I'm drinking your nasty blood." Partner said while crossing her arms.
"Partner, just do it! This is not the time for us to be fighting!" Lucifer reprimanded her.
"Infighting, huh? This'll only make things easier for me!" Frost laughed.
Frost suddenly stretched his hands using his slime body, while still being covered on his hard, divine ice armor, he swung his axe against the two of them at an insanely fast speed!
However, Lucifer barely managed to intercept the attack by summoning his Phantasmal Death Scythe and infusing it with the powers of the Fire Dragons within the Draconic Records.
"This damn sneaky bastard… Do you call yourself a knight when you sneak on us all the time?! Cowardly piece of shit!" Lucifer roared furiously. "Partner, drink the damn blood!"
"Uuuggh, fine!" Partner cried, desperate of how the battle was only going to get worse and worse, she waved her hands and quickly manipulated the blood flowing out of Lucifer's wound into a sphere she quickly drank completely. Lucifer's wound immediately closed after that.
"{Eternal Winter Blades Storm}!"
Suddenly, Frost conjured a powerful magic spell, as countless magic circles appeared around Lucifer and Partner at the same, as thousands of gigantic, twenty-meter-long swords made of divine ice started falling over the two of them, and then exploding upon contact, freezing any of their surroundings!
BOOOM! BOOOM! BOOOM! BOOOM! BOOOM!
"Uuuggh…! {Divine Draconic Arts}: {Muspel's Divine Blazing Fortress}!"
Lucifer hit the ground and channeled more of his powers and those of the Draconic Records, the only Bloodline he had access to was the Fire Dragons, as he was originally one. Thanks to this, at least, he was able to conjure incredibly powerful flames temporarily, although unlike his sister, he had to spend enormous quantities of energy and mana to do so.
A gigantic fortress of blazing draconic flames was erected, surrounding his body and that of Partner and protecting the two of them from the rainfall of icy swords. The flames were so strong they spread into a shockwave, melting the ice around and easily weakening the magic of Frost.
"{Frost King's Divine Shield Charge}!"
Frost emerged through the flames, charging across them using the Divine Shield of Uller to protect himself from the flames and completely destroying Lucifer's defensive spell, at the same time as he clashed against his massive body, throwing him down into the ground!
Lucifer opened his jaws, unleashing a deadly {Infernal Dragon Breath}!