Kingdom Hearts III: Second Keyblade War

Kingdom Hearts III: Second Keyblade War (KH3:SKW) was a fanfiction based around and after the end of Kingdom Heart: Dream Drop Distance that introduces a new Dark Sora as a part of the Second Organization XIII, the shard of Xehanort's heart brings out the darkness from Sora's heart causing him to gain an unstable personality, a personality with very unheroic desires and ideas. Soon Sora finds a wayward soul in the form of the Second Organization's No.XI, who despite working for Xehanort and in the same situation as Sora is in, does as he wishes and has plans of his own... the more chaos between then and there the better.