Harry Potter and the Forgotten Realms

The Giledon Potter was a world traveler. A wizard with powers to go against gods. It also helps that he is a descendant of a demigod of the Stormlord.
But a mistake happened, his teleportation circle malfunctioned and he was sent to a different universe all together.
After many years instead of finding a way back, he stayed, learned magic from the wizards of this world and planted his roots down in this world.
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Now his descendant is now reduced to one and sleeping in the cupboard under the stairs. Harry Potter is woken up suddenly by lightning coming out of his.....hands?!?