Issues...
1.) Darkness should scale with level, and should deal more damage than what was sacrificed.
2.) Weapon Aptitude should come at level 2 or 3 or state that it has a minimum effective Fighter level of 0. Otherwise by RAW a Fighter 4/DK 1 has a Fighter level of 3, insufficient to qualify for Weapon Specialization.
3.) MAD is BAD. As a heavy melee class, you're already looking at Str & Con as your main stats, adding in abilities for both Wis and Cha weakens the class further. If this were a full caster, I'd let it slide, but this isn't even a Martial Adept.
4.) Dead levels. They're bad on any class, but worse on a melee class.
5.) None of this you/he/her business. None of it. Choose a pronoun and stick with it. It's a minor thing, but it looks sloppy... especially when you switch from second to third person and back.
6.) What is up with that Will save progression? It doesn't belong.