His eyes changed from cerulean blues to that of blood red with 3 tomoes wildly spinning in them and they changed again, this time into a red swirl, glaring at the similar reds of Theon.
"Is that all anger, hate and malice I'm seeing? Oh my, Naruto, I didn't think you had such hatred in you," said Theon in a faux emotional tone.
Naruto isn't listening to any of this as everything he is seeing is red. This Demon trapped Sirius and hurt him and in addition to all this, he injured his precious son in front of him, as to spite him.
All this made his magic go haywire as the rocks and area around him started to crack at the passive pressure his magic is creating.
Loke was horrified by the expression on Naruto's face. It was full of hate and malice as if he trying to kill this Theon with his stare alone.
And Loke knew if it is some other person instead of this Demon, they would have been terrified by now by the glow and danger Naruto possesses.
'Loke, take cover and don't get involved,' heard Loke someone speak. It was similar to Naruto's but it is as if they were controlling something primal and Loke did as asked without a question as he took to a large hill to the side as fast as possible.
All the demons were too engrossed in Theon's glory to see him and Loke hid behind a large peak while peaking through the gaps of the rock.
He also made a chain spear around him as he had a suspicion that things are going to turn ugly, fast.
"Let me explain how I knew your magic," said Theon, as if he is lecturing a small child. Naruto had enough and a reddish-orange fire started to surround him.
"Susanoo," said Naruto in a cold tone.
The ethereal flames started to spread around him. Bones started to form along with veins and muscle, covering the arms and rib cage that already formed.
Its head, which was just a skull started from veins and soon, it took the face of a warrior and has a helmet that features a long tengu nose, two spikes over each eye, a slit stretching across its mouth, three gaps on each of its cheeks resembling Naruto's whiskers and one additional gap on its chin.
Its arms started forming, and 4 arms formed in total with 2 holding swords and the other 2 holding out as if praying.
The fire started to spread and a lower body formed, with 2 legs and an overall armoured suit as a samurai started to form across the whole body, which stood a good height of 50 meters.
It's a colossal ethereal structure with reddish-orange flames spreading across its body and 2 katanas and prayer beads in its other 2 hands.
Everyone in the vicinity can see Naruto's ethereal structure with ease while the blonde is in the middle of the structure, at the place of its heart.
"Yasaka Magatama," said Naruto and the beads in his hands started to spin and formed into a spinning disk. He threw them across towards a cackling Theon.
"What a pain," said the Demon and with a flick of his hand, black mass started to form and nullified the magatama.
"Interesting," said Theon as he received the knowledge of what the attack was.
"That's a nifty trick you have," he complimented the blonde, who isn't listening to him.
"Kamui Shuriken," said Naruto as he threw another black shuriken towards Theon. Theon, who was expecting it to be the same attack as before, sent his black mass at the shuriken, only for them to phase throw the black mass and as it was about to hit the Demon, another of his kind jumped in the way and split in half, his body scattered across the area.
'What is this? A type of teleportation magic?' Thought Theon as his superior senses gave him a good idea about the attack used.
While Theon was pondering what happened, Naruto was slicing through the demons who stood in his way like there was no tomorrow.
His 2 ethereal katanas, started slicing through them like a hot knife through butter, giving them no chance to defend or escape his wrath.
Loke was looking from the cracks of the rocks in awe. He didn't know Naruto was this powerful and the humanoid structure didn't help much.
'What power! I didn't expect him to be this powerful. What is that thing? It is slicing through all those demons like they were leaves in a storm!' Wondered Loke.
Though he wanted to know what was happening, he chose to wait and watch as he knew he wouldn't stand a chance against the opponent Naruto is facing, not without his Regulus Magic.
Theon on the other hand had enough. He thought of giving the blonde a chance to join his army and become useful for his cause, but the blonde had done enough damage that he was considering killing him and using his magic.
His magic, Mimic, can copy anything, after all. Mimicry allows Theon to reproduce any magic he had touched.
It was limited by the type of magic and container the target has, but his ability also has the shapeshifting ability, which negates that weakness and gives him the perfect 'magic' to kill the man he loathes the most.