Hell Knight!

Quote from Maegortharley >>

Level 18: Infernal Damnation

Whenever damage from your Infernal Weapon or Infernal Wound reduces a creature to 0 hit points, it dies, and its soul emerges in the River Styx as a lemure in a layer of the Nine Hells of your choice after 1d4 hours.

If it is not revived before then, only a wish spell can return it to life. 

 I know this is more of a ribbon feature, but two level 18 abilities seems a little bit ridiculous in my opinion.

Other than that, I don’t know the original class enough to comment about the differences, but from what I’ve read it seems like a fun class to play (if not then, at least now.)

The only thing I would have liked to have seen was a way for your character to be able to cast the darkness spell or have some kind of equivalent. Maybe an Aggravated Wound effect covers the target in darkness for one round, and if you hit them early enough you can still attack them with your extra fighter hits. Just brainstorming.