Lore/Story Origins...

To all those who travel the lands and seas to that of the Province of Wynn, I wish you to head my tale as not but a warning, but a message from that of whom you could say is the creator of the occult, the forefather of swordsmanship, or even Founder of Wynn... My name is one you know today, as the Corrupter of Worlds, however few knaow as Strato. For those whom thoughts ponder the creation of this message, do not fret for this is the remaining good in the man who lived many moons before speaking this tale.
Long ago, there was once but an ordinary man, one whom knew nothing of the spiritual realm, or the darkness that pursues the pure. His name was Strato, and he was nothing but a mere "rookie" adventurer of sorts, he had little experience in the field, however he was strong and noble, with a heart as pure as gold. He traveled far and wide in search of not gold and silver, but new lands for his studies. Yet that one oh so fateful day, he stumbled into an undiscovered land within the Forbidden Forest, one of which no one has ever returned. as prophecy spoketh, "For those of purity travel, yield to my message, a power of undeniable truth lies within this forest, yet for those who are that of a drop of corruption, they must face their ultimate demise." Once Strato reached the center to this forest, he found what the prophecy spoke of. An enormous gate, seeming no beginning or end to what lies beyond, was set within the forest's core. With a simple push, he opened the gate to what we call home.
Once Strato walked in, he found within creatures he had never seen, one's of long noses, and tan in color, however still seemingly human, however unlike any back home. They saw him, wondering but the same thoughts he had, who he was and where he had come from. These creatures were the Villagers, a nomadic, yet still peaceful tribe of people with awe-inspiring constructing skills. While we build with stone and wood, they build with Quarts and Jewels, for these are much more common in their world then ours. Although they were a different race, the villagers still spoke our tongue, and invited Stratos in to their homes without hesitation. Llevigar, their capital city and most prized of them all, was where he would stay for the next 2 moons to study their ways.
Upon the 2nd moon's passing, it was time he began to find out what was different between the two worlds, so upon this decision he discusses this matter with the King of Llevigar. Yet he denies Strato's request due to one mistake that could cost him his life. This one variable between life and death, was the one biggest discovery Strato would make, and that was the properties of the Province's magic. The King explained how this world contained a magical essence prophesied to only be able to be used by that of men from new lands who differ from the villagers... The King told him it would take 7 moons to train within the 4 statuses of magic, that of the Warrior, the Mage, the Assassin, and the Archer. Thus Strato's Training Began...

For the time he spent training, you could say he became more powerful than even your beloved deity, Bob, for unlike how Bob mastered the magical arts in their basic form, however Strato invented a new form to these arts, or what you could call a mastery. Warrior turned to Knight, Assassin to Ninja, Mage to Dark Wizzard, Archer to Hunter. This is how the masteries came to be what they are today, all based upon the most powerful of Deities. Once his training was complete, he ventured not through the path he had thought he would, but through the Gate to New Lands. Although the king told him not too, both his adventurer's instinct and curiosity went into a massive urge to see what lies beyond. It was nothing of the magical lands that coexisted as gavel though.
All that existed there was death and suffering as far as the eye could see, volcanoes erupting throughout the lands, storm clouds filled with that of acid, and the one most heart wrenching sight to behold... Villagers whom were banished were suffering the cruelest of fates, they were becoming the undead by the bite of a single infected being.. They were called zombies, and they were not the only threat. As soon as Strato set foot upon the land, he looked up to see a barrage of arrows flow down towards his location. Although he had retained a cover from the arrow, yet again a sight of death emerged from the clouds. a large black dragon with glowing highlights of violet swooped down in an attempt to devour him.
With one decisive blow, he swung his blade to cut right down the belly of the beast. The monster crashed behind him yet still drenching him in his burgundy tinted blood. Something was off though, he wondered why the dragon would allow him to let him be killed so easily, that was unless it was intentional. Then the thought crossed his mind. He looked everywhere for a place to clean the blood off, yet it was too late. The blood infused within his skin turning him violet, his hands turned to claws, his teeth became fangs, and his pupils became black as night. he grew a forked tale, and his height shot from 6 foot 2, to 13 foot 3. Now he was half man, half terrifying demonic entity. He further began scouring the lands for the one thing he craved, a chance to fight an extraordinarily powerful being. He would get the chance, however not for thousands of years, and until then he would be sleeping within his cave until he sensed the arrival of a newborn superpower. That man would be Bob...

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Sorry it wasn't so long, I would've written longer if I didn't have just 45 minutes and it were late!

 

Pleaseeeeee add a tl;dr.
I just wanted to browse another theory before swimming ;-;