Fate/Undying

When fulfilling an adolescent fantasy goes wrong and Hale ends up locked away under the Earth for who knows how long to suffer with nothing but his own thoughts as his only companions, what will he do when the actions of a single, perhaps unknowing, magus end with him released?
Will he endeavour to alleviate his boredom any means necessary?
Will morality affect him as it did before?
Will he become a part of society as a cog once more?
Or will he realise ambitions that he'd spent maybe centuries cultivating?
In a world where Gods exist, Aliens seek to end man, ancient heroes fight wars for the greed of heartless magi, just what is someone who had an adolescent fantasy fulfilled to do?
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This is my first work so please be lenient. Any and all feedback is appreciated.