scrap the wishes, weapons & items. Poison and magic immunity makes you able to travel Valyria unhindered. an army of 75.000 just makes the story pointless, it's enough to take the throne on day one.
Always wanted to read a GOT fanfic with a nerfed version of a twilight shapeshifter. it's not that improbable when you got direwolves, warging and greensight as a natural occurrence in the show.