I like the idea of a triple Venatori Commander, mirror images, not sure which one's the "real" one.
Also, you could make Venatori Commander's spells actually do damage. Currently on Perilous, I can stand in fire and wail on her, and not give a crap about her. Increase the damage of her fire spells, the DOT tick of her Wall of Fire should at least be 300 a second. If you can't figure out how not to stand in fire, you shouldn't live to tell the tale.
Demon Commander nerfed is a joke now. I can solo him on my archer. I shouldn't be able to do that.
Red Templar is fairly challenging as is, but for an added challenge, definitely make him faster. Samson is sluggish. Kite FTW. He's rough on melee, but an absolute cinch for any ranged class.
Why is the Arcane Warrior so unbeliveably godly? I can solo Perilous spamming 1 button. Either buff warriors, (buff guard, give them better armor, or buff damage) or Nerf the AW.
I'd like to see Katari be a playable class on Perilous. As it stands now, he is gimp compared to Reaver, and any other melee class.