Or we could just have a chaos lord on a dragon with a flail.
The dragon also has a flail.
But that would be "Too convenient".
You enjoy the "Whose is bigger" debates, I do too at times but I think we're doing this thread a disservice already. As much as one can to a thread about... elves....
Anyway, it is blatantly obvious that the Chaos Lord is a better fighter, but is plagued by a lack of decent magic items, whilst a High Elf lord, if tooled specifically to fight a Chaos Lord, might survive, even win.
In the end it is down to the dice. We merely stack them.