Mammon made sure to teach Heracles about the harm and bad humans do to themselves, and that demons are a concept made by humans to throw away their guilt and shame on.
"There are no demons, only angels! And they're us!" Is the phrase he said.
And indeed there were enough proofs for Mammon to showcase and prove his statement.
So in order to destroy bad, humans who do that must be destroyed!
And that's how the real start, started! Heracles has started executing missions with the assistance of Mammon. His first kill will always be one he'll never forget.
In the deep night, a man in his 30s was being chased by multiple soldiers through the woods...
"He went from here, quick!! Don't let him escape!"
The man was quick and slick, he hid his body perfectly that no one was able to detect him.
"Damn it!
We lost him!!"
"You fools!! He won't be far from here, let's get out of the forest!"
The soldiers kept on their ways, he didn't move until he was sure no one was there...
Meanwhile, Heracles and Mammon were watching from the sky.
"You see that man! He's a serial killer that enjoys slaughtering innocent people for his own enjoyment. Then claims that he does it for God! He doesn't realise his wrong doings and will never do. This will be your first mission Heracles! Give him a quick and easy death if you want, although he deserves a worse one."
Heracles was a bit hesitant for a moment, to kill is something of great magnitude...But hearing his backstory, he felt the need to act!
The man thought he escaped with his life, and couldn't hide his happiness...
'Finally....I am finally free!! What will i do now?
Maybe I should settle down...Have a family so far away where we can live peacefully once again.
My bloodline should continue!!'
As he was running away with his dreams, he found Heracles standing so tall in front of him!
"....Wh...Who are you?"
Heracles does not answer, his look was deep and dark.
"...Don't tell me you're one of the corrupted king's soldiers!!
You don't look like one...I think you're just like me, am I right?"
Heracles still does not find words in him...He approached the man and put his hand on his shoulders.
"My name is...Heracles."
The man was a bit weirded but brushed it off with a smile.
"Oh hahahaha..My name is..." Before being able to complete his sentence,...Heracles ended his life right on the spot, turning him into ashes!!
He didn't want to know the man's name...It was maybe going to hunt him for years to come.
Mammon descended slowly.
"Job very well done, how does it feel to bring justice to this world?'
Silence took over the place...
Before he replied.
"Awful...It feels awful!"
Mammon. "Let's get back, i realise the emotional state you're in..."
But since then, killing became easier and easier with each time...He didn't realize how robotic he became, as he trusted Mammon blindly, in fact...He didn't realise that he no more cared about the reason he does it for. The stronger he was, the more he killed.
10Years has passed since the magical night.
It was time to introduce him to a new concept, which is....Atlanteans!!
"Listen well...It's time for you to know the source of all evil in this world. Those who influenced all those who you had to kill. A very hard headed bloodline called, the Atlanteans!
They have been our enemies since the beggining of man, a self righteous arrogant authoritarian people who think they have truth in their hands, and dictates it on the rest of people.
Tell me Heracles, What do you think of religion?"
Heracles. "Religion...It is just as you said, an attempt to claim that truth is in the hands of certain people. I have seen enough to know that it brings nothing but harm and misery!
We would've been way better off without such thing existing!!"
Mammon grins. "Indeed, those same Atlanteans are the ones who came up with it, in order to gain followers and bring chaos to this natural world.
However, they have gained powers similar to yours by stealing some of our knowledge!!
Currently, a war between us is soon to happen. The winner will decide the future of this world.
I expect you to fight for a better future!"
Heracles. "Will surely do, don't worry about it."
And so, Heracles has decided to dedicate all his remaining time to gain more power...In order to do so he didn't just rely on Mammon, but also asked to be teached from all other princes of hell.
2 have rejected his request, Belphegor and Lucifer.
The first was so lazy that he had no desire to teach anything to anyone, the other was simply impossible to reach...
As for Leviathan he teached him one simple technique, which was actually a pretty powerful one! He teached him how to turn his fire into ice!!
Amadeus teached him some of the underground knowledge, which abled him to perform seals and spells of the highest levels!
Lilith in the time he went to her, has only teached him what was it like to be in the most euphoric intense lustful state a human can ever be. He never complained even once because..Who would?
He found out that he truly has to thank Amadeus for that special gift!
The last one, was surprisingly more helpful than the rest, Beelzebub has helped Heracles find the balance between all what he learnt, and the right way to use all of it.
As he was the master of all underground knowledge. He turned Heracles into the first and most powerful human demon who has ever lived til this day.