You are correct, it's Chronos, and yes he was a great villian too. Kanas- you probably had Kalas in your mind- he too was awesome.
I seem to be the only one who enjoys the Ahriman storyline.
But season 6 was, with the exception of a few episodes a bit pointless.
There is one episode he wasn't even in.
Picture the scene, i'm 12 years old, staying up until about 4 in the morning to watch it, and i'm like "hmmm, 20 minutes in, and still no Duncan?". Was pretty pissed by the end of the episode.
- The entire series.