Woow Raze, you're almost done with the Ego Draconis part ?
Level 35 : in the past I ended ED at level 35. Started the final battle at level 35 and ended L 35.
(but that was at easy/normal difficulty ... now I wish to try all battles on nightmare.
The only battle I've tried so far on a lower difficulty was the battle against Zagan !
This battle is in some way indeed very painfull and lowering the difficulty didn't do much I find !! It take a long time before I killed Zagan ... on casual difficulty !!
So after this experience I NEVER go back to a lower difficulty ...
But I think (for me) the only reason why I had so much problems with Zagan is because I always have more problems in small caves. Except the Sinister Cave (Barnabus), that wasn't a problem because their my dragon had more place to fly ! AND the flying opponents in the Sinister Cave aren't so aggressive as Zagan and his flying friends

!