Theon was not sitting quietly all this time as he knew to defeat an enemy, attacking when they are not paying attention is the best method.
He was preparing one of his most powerful attacks he can use and its preparation was done when Naruto was attending to his puppet and he attacked.
"Nuclear Magic: Nuclear Strike," said Theon, extending his hands. His hands were engulfed in the same golden yellow flames, however, when fully charged, they changed into a shining emerald and charged towards Naruto.
Naruto sensed a large build of magic and turned to see a green flame coming towards him. He knew that even his enhanced body couldn't take it.
"Amaterasu," said Naruto, making a layer of black flames around him. To be safe, he also protected himself with the ribcage of his Susanoo.
The green fire came towards him, rather slowly compared to the last Nuclear magic attack, Naruto observed and hit his black flames. Standing to its name, Amaterasu nullified the flames, but the real problem started there.
The Nuclear Strike exploded after coming into contact with his Amaterasu, spreading an eerie green smoke across the desolate wasteland.
Naruto observed how the smoke started degrading the area around them like melting the ground and making snowfall in an empty land.
"What the fuck did you do? It changed everything, man," exclaimed Naruto as he tried his best to dispel the mushroom cloud that was forming upon them.
He had a bad feeling about this as he couldn't sense an inch of life in a 100-kilometre radius after that attack, which he previously sensed some trees here and there.
"You are impressed by my Nuclear magic? Thank you. It is wonderful magic if I say so myself," started Theon.
"Cut the crap you filthy shit. Tell me what did you do?" asked Naruto and Theon smiled widely.
"My Nuclear magic is special, yes. But its speciality doesn't lie in the magic alone. But the after-effects. It releases a toxic gas when it is countered or nullified. This toxic gas is more dangerous than the attack itself.
It spreads in the air, snatching life from anything it comes into contact with. I think that would be enough. After all, I mustn't give all my secrets away," said proudly Theon, irritating Naruto even more.
"Dome of Death," called Naruto. A large dome formed around Theon which made the Demon smile.
"Oh, Naruto. Did you forget I knew all your attacks?" he asked and as the Dome started heating up, a large wall of flames formed around Theon, protecting him.
"Sea Gods: Judgement," called Naruto, making a large water hand that fell on Theon from the sky. The Demon just vaporised the water with his flames.
"Incinerate," said Theon, sending a large flame towards Naruto. It was upon the blonde in seconds.
"Shatter," said Naruto used his light to shatter the flame with his light. Due to their increased potency due to Naruto's Stampede mode, they cut through the fire with much ease.
"Nuclear Flame," said Theon and created a nuclear explosion enveloping a large area. Naruto escaped the area with much ease and Theon changed tactics.
"Ink: Venom," said Theon, releasing his ink magic. The ink he released was so much that it covered a large area. It started to separate in all directions.
Naruto observed how it started taking form and took the forms of demons he fought before Theon's awakening and they also had black lines across them much like Theon himself.
They opened their eyes and started attacking Naruto without any sense. Spells flew in all directions without any aim. And hit everything around them.
"Light Style: Arrows,"
"Light Style: Giant Arrows,"
"Light Style: Exploding Arrows,"
"Scatter,"
"Shatter,"
"Senbon,"
Attacked Naruto as his attacks went in all directions to stop the senseless demons, but much to his disappointment, when they hit one of the ink demons, they would disperse and reform again as if nothing happened.
"Death Strike," Said Theon, attacking Naruto as he was putting all his effort to kill his subordinates. The Death Strike is also an attack of his Nuclear magic.
It is a wide area spell with deadly radiation that completely destroys the flesh and soul of all living beings while leaving material objects intact.
That means, his Ink creations will survive this and it will kill Naruto even if it grazes the blonde's skin. Naruto, even though busy with his effort killing the inky things, knew the effect of Theon's Nuclear magic.
"Kamui," he said, turning intangible at the last second, escaping the effects of the toxic magic. Theon was not deterred by this as his ink subordinates absorbed the attack.