I should go finish that Titan Fighter run of Hexen. Last time I was playing, I beat the Heresiarch and saved the game before going to the secret level of the hub and moving on to chapter 4.
I've found that the game was hard only at first, until THANK GOODNESS I FOUND THAT HAMMER. Chaos Serpents on the hardest difficulty are suicide to face with melee combat if not done correctly, or swarmed. Or spotted from afar. Damn that shit.