At first, Alex thought that a demon had taken over Randy's 2nd uncle's body. However, after a short observation, he realizes that the man isn't possessed. Instead, the man is the one turning into a demon.
After all, he talks about his ambition to take over the family and how he should've just killed his siblings and their children to get everything. The demonic power in the ring is only enhancing his desire and turns him into a demon.
This reminds Alex of how Tartaros turned Minerva and her father into half-demons. The same probably happens to this man, but he can't control himself as well as Minerva and her father, maybe because he is much weaker than them.
"Alright, man, I'm tired of hearing your nonsense, so how about we finish this already?" Alex is bored of hearing the half-demon's chatter about his shallow ambition.
The Kingdom's Knights and Mages will come soon, so he needs to end this quickly or he won't be able to absorb the half-demon's magic power. It will be such a waste, so he needs to act quickly or he won't get anything but fatigue.
What Alex says seems to anger the half-demon greatly. He even recognizes Alex as the one who stops his plan to kill everyone in that meeting room even though Alex was transforming into Randy and used Shukaku's form while now he uses Matatabi forms.
"You know that it was me? I thought you won't know because I looked different before."
"You were transforming while chasing me, so obviously I recognize you."
"... I guess you're right." Alex forgets to consider that fact. He thought the half-demon could sense his magic power, so he was just overthinking.
Well, doesn't matter. What's important now is he needs to defeat the half-demon. So Alex quickly charges to attack it before it escapes again. But it seems the half-demon doesn't have any plan to escape as it also makes its move to attack Alex.
Alex covers his sharp claws with hot flame as he approaches the half-demon. He dodges the half-demon's attack, some purple energy blades shot from its claws by lowering his body as he runs.
Then Alex swings his right burning claws at the half-demon's chest, sending it fly to a building, crashing into its wall and breaking it. Alex can't care about damage to his surroundings because if he doesn't stop this demon here, then it will kill people.
He wants to chase the half-demon, but it comes out on its own very quickly. It has some cut wounds on its chest from Alex's claw attack, but it doesn't seem to feel hurt that much because it can still move normally.
The half-demon laughs sinisterly as it walks slowly. Alex wants to attack it again, but suddenly purple mist comes out of the half-demon's body and spreads everywhere. It gives him bad feelings, so he steps back.
Right at that time, the Knights are coming to the plaza. They quickly raise their weapons at Alex because they think he is the demon that's being reported. Well, he certainly looks like a demon in his humanoid Matatabi form.
"Wait! I'm a Mage from Fairy Tail. The demon you are looking for is inside that purple mist." Alex shows his Guild mark on his left shoulder.
He pours some magic power into it to make it glow silver so they can see it because the symbol is hidden by his blue-black flame skin. Luckily, the symbol is made out of a spell and can glow when he uses some magic power on it.
The Knights recognize the Fairy Tail symbol and immediately apologize before shifting their focus on the purple mist. They stupidly surround the purple mist that keeps spreading as if they can stop it with their swords and spears.
"NO! GET BACK! That purple mist might be very dangerous. Don't get too close to it!" Alex shouts at the idiot knights who don't know what the mist can do, yet they approach it fearlessly.
"LISTEN TO THE MAGE! DON'T GET TOO CLOSE TO IT YOU IDIOTS! IT MIGHT BE A DEADLY SPELL!" A muscular middle-aged man suddenly shouts when he has just arrived on the scene. He introduces himself as the Squad's captain to Alex.
"Do you bring any Mages with you, Captain?" Alex asks curiously.
"I have asked the Mage team, but it will take a while for them to arrive. Don't worry, my Knight Squad is trained to fight against Mages. Though this is our first time facing a demon."
Alex assumes that Randy's family has reported about the demon to the Knights. That's why they know that it's a demon, not a Mage or a beast.
"Mages and demons are different. Sometimes human magic won't even affect demons, so they are very dangerous. I don't even know what that purple mist is. It might kill normal people instantly, so I don't think your Knight squad can fight it because it's hidden inside that mist."
Just when Alex says it, a purple liquid ball is thrown out of the purple mist. It falls near some knights and evaporates instantly, creating thick purple gas that strangely moves to the nearby knights.
Those who are touched by the purple gas suddenly feel excruciating pain as their skin turns purple. It doesn't take long for their whole bodies to turn purple and when it happens, they die. In just a few seconds, the infected people die.
"SHIT! HURRY AND GET AWAY FROM HERE!" Alex shouts, but he doesn't really need to do it because everyone already runs away.
He can't let this demon throw more of that deadly poison liquid ball, so he quickly uses a spell. Alex slams his hands on the ground and then a very wide red magic circle that covers the whole plaza appears on the ground.
"Fire Style: Cat Flame Seal!"
Even though all of the Tailed Beasts' skills have transformed from jutsu into magic, Alex and them somehow found that keeping jutsu naming sense into their skills are making their skills or in this case magic spells a lot better.
It may be just a name, but it affects how they imagine their spells. Imagination is important because it can affect the spells' power, energy efficiency, shapes, scales, etc. That's why they decide to start keeping the jutsu naming senses on all of their spells.
Anyway, the Cat Flame Seal that Alex has just used is a spell that creates a round wall of very hot red flame. The round wall is tall, around 25 meters in height. The top part is hollow, but it's not like any enemy can jump over it to escape, at least this half-demon can't.
"Please stay outside the firewall! I will enter to fight the demon." Alex shouts to the Knight Captain before entering the firewall.
The knights can only follow his order now because they can't even get closer to the firewall. After all, it's too hot for them. Even if Alex didn't tell them to stay away from it, they still won't be able to get too close to it anyway.
Inside the round firewall, the half-demon's purple mist has disappeared. It's evaporated completely by the heat of the fire. The half-demon tries to shoot some of those purple liquid balls onto the firewall, but they all are blocked by it before they evaporate too.
The firewall might be made out of fire, but it is also a solid magic wall, that's why the liquid balls can't just pass through it even if they don't evaporate instantly. It's as hard as a concrete wall and Alex can control whether it'll be sturdy or not, that's why he can pass through it when he wants.
This is such a good trait of this spell, but it also has a problem. It costs a lot of magic power to maintain. So Alex can't keep it for too long. He needs to finish the demon ASAP before he runs out of magic power because of this firewall.
"Well, you've chosen to be a demon, so you should be prepared for the consequences." Alex grins before he charges at the half-demon.
The half-demon thinks it can fight Alex, but it can't. While it gained enough power to match some decent Mages, it still doesn't have any experience at using its abilities in battles. It also doesn't seem to have that many abilities in the first place.
Even with great power, it will be useless if someone doesn't know how to use it and that's basically the case here. This half-demon can't fight and never has any proper fighting experience even since he was still a human.
So Alex doesn't have any problem fighting it because it can't even throw a punch properly. Alex hits its body on different spots with different moves. Punches, knees, kicks, claws, all land onto the half-demon's body and it can't even land a hit on Alex.
"You should've just stayed human."
Alex grabs the half-demon's face and starts absorbing its magic power. It screams, but Alex ignores it and just keeps absorbing it until its magic power is empty. But he doesn't kill the half-demon because it's the Magic Council's job.
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Ch. 109: Guild Masters Meeting