When a legend is transported into a new world in the midst of his greatest moment, how does the dragonborn adapt to his new life? (2nd person. Gender, name, race, and fighting style are up to you)

Late at night, in the everfree forest, a strange, circular portal of a hard grey stone appeared. Many things come out, but the locals only find one.

Billy the Mighty Mage had just died in a battle with the demon King, Archhaven. He rejuvenates, teleports, misses, and ends up in Equestra.