I'm rolling along and I haven't really run into anything that's given me much trouble yet, so I'm thinking I'm Mister Billy Badass. Out on a hike last night I see a dragon lair pop up on my compass so I go have a look. I move in and take him out with average effort.
Then, as I walk over to claim my new shout, this lich jumps out of a coffin and proceeds to obliterate me. He had a name too, not just something generic like Lich King, so I guess he'll come up in a later quest. Anyway, being the stubborn ass I am, I spend the next 45-60 minutes trying to kill this guy. Finally Lydia knocks him off a cliff and he stays down there shooting fireballs up at me but there was a slight overhang blocking them from doing much damage. So using that a cover I put about 25 arrows in him and finally took him out.
I feel a little bad not ultimately taking him out head-on, but after an hour of getting my ass handed to me every which way, I'll take the kill. I recovered his staff and found it shoots 70pt fireballs with a 15ft blast radius. Those hurt.