Have you ever fought Drelas in Drelas' cottage? Man, that was one tough fight.
Gosh, yes. I really wanted his house, so my mage barged in about level 15. Drelas used Adept level Destruction spells (like Ice Storm), and I only had Apprentice level ones, with no Impact. He rocked me over and over. And of course he heals himself when I finally am about to end it. After a half dozen tries, I was victorious.
My latest unbeatable boss has been Kvenel in Volunruud. I'm on my level 13 cleric character, using mace/shield and restoration. I first encountered Kvenel at level 5. Terrifiying. So I went questing, leveled up, got some nice perks, and came back for revenge. I tried this fight for over 2 hours this morning. One time, I
finally won, only to watch Jenassa fall along with the boss. I had accidentally smacked her with my maces' backswing. And she died. I was devastated, and thought, well, I know I can beat him, I'll reload and do it again. Nope, not happening. I should have saved after that win and just mourned the loss of Jenassa.
After my game froze on the 30th or so reload, I decided I was done for the day. Then I look up Kvenel on wiki, to see that he's got 700 HP (if you fight him before level 17- its 1000 HP after!!). No wonder I was having such trouble! I
will get my revenge, someday!