If you use zanmato on the dark aeons it's not really an accomplishment, nor is it a measure of the dark aeons "crappiness".

Yes they are hard, but not when you use zanmato! I've beaten valefor ifrit and ixion without zanmato, currently trying to shiva (stupid bitch and her impulsive overdrive). ....Yeah... I admit, I am using this post as an excuset to state I can finally kill dark aeons. Probly dont think it's that great, but it is to me XD