Holy crap I'll never forget when saw my first dragon priest, at the time I had no clue try even exsisted. I had just finished filling an elder dragon fill of arrows, I thought the battle was done, no enemy's around, I can finally relax for minute. Then Krosis rose from a huge mountain ledge and sent this ball of flames that scared the heck out of me. He was way harder to beat then that dragon. I was rewarded very nicely though. I won't say anymore just incase if anyone hasn't experienced a dragon priest. It was epic and very scary all together. The scenery was very dark and creepy also.
Hehe I can top that, because I just found Krosis earlier today. Never seen or even knew what a dragon priest was. I am lvl 14, just finished killing a dragon and all of a sudden he is just tearing me apart! unfortunately I'm really only melee, so it took me at least half an hour of kiting and LOS'ing him, run up, "Fus!" get in two swings, run away heal, wait for magic to regen.. omg took seriously forever. those places should have a warning level, "do not approach until at least lvl 20" or something lol.