Hunter x Hunter (HxH): Seeking Immortality

Elias Deville was an odd individual, with some unfortunate circumstances befalling him. After a certain incident, he was never the same. After he turned 18, he immediately joined the military and seemed to have turned his life around, and was all around living a fulfilling life... until that fateful day...

Note:
This is not a system novel. Perhaps, I might explore other worlds... and if you want a spoiler, read the very last bit.
*Cover is not mine
*No characters from Hunter x Hunter are mine

SPOILER BELOW! Be warned.
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I am planning on having the MC fuse with Meruem and re-reincarnate into the past. At that time, he will have some changes and do things differently.