After doing more Besiegeds than I can remember...
Weakened...Petrified...but level 75! Thanks to the double Besieged 10 minutes ago. No cool Level Up animation though D: Oh well.
I'm not sure how I could thank everyone who helped me...This took over 2 years and I'd have to list over 100...
I noticed they were casting ALL tiers of thunder and blizzard spells, I and IV most often. Probably has something to do with spells based on the day and whatnot.