I've just added Chapter XIV - O Thanagor to the original post!
Make sure you listen to the "Arthas, my son" and "Invincible" soundtracks. They're both fantastic.
I hope you like it! (and, like always, I suggest you read this on DeviantART as the formatting here isn't very good. It's also on Fanfiction.net but the formatting there is even worse)
Chapter XV and the Epilogue have been added to the original post! Thus meaning that the story has come to an end. You can also find them on Fanfiction.net or DeviantART.
I hope you enjoyed reading this. Thank you for the support!
Note 24/08/2016 (for those who may have found this work of fanfiction recently):
I started writing this long before Legion was announced, even before WoD was released and thus the story doesn't follow the events in the online game or the new lore established by Chronicles (some things may be similar).