You where just a regular orphan, or so you thought until one day a group of hooded people appeared in your room claiming you were the chosen one and whisked you off to a magical land. One problem, the chosen one was in the next room over.
They quickly notice their mistake and instead of doing the right thing - you know, taking you and the chosen one to that magical land - they dump you back at that orphanage and whisk of again.
Little did they know - did you know - that this incident was the thing that necessitated finding a chosen one in the first place. Because they had pissed you off royaly. You had been relatively content with life till now and had endured any hardship with an iron will, because you always thought that good will triumph in the long run.
But screw that, finally getting out of that place, finally getting a chance to shine - and they took it away from you. They teased you with a destiny, because they were to dumb to read their instructions correctly the first time.
You take all that anger and forge it into determination. You had been able to get a glimpse of that magical land and knew that there had to be a way to get there yourself.
You are well into adulthood, and spend years to prepare, learning everything about mythology and magic etc. you could find, and then science, science, science. You hace become a famous engineer, adored by many, because psychology was just another science for you.
Cracking the barrier to the magical land is hard, but doable, and so you infiltrate it, carefully observing this world, integrating yourself into the culture, using your superior technological knowledge to give yourself an edge when necessary.
After your information aquisition is done, you start the second part of your plan.
It takes you rougly a week to conquer everything and become supreme overlord.
Also you find out that the hooded guys were your parents.
