I'm also having problems with this mission, but of a different kind. I can't kill Isabelle. I reach her with a Phaedon on the 2nd day of the 2nd week. I'm met by 28 archangels, 129 champions, and others. What should I do? Difficulty level: Warrior.
I also defeated Isabelle around the 2nd week and had no problems. She had only three archangels, about 20 champions, and other troops accordingly.
"- Так кто же ты, наконец?
- Я - часть той силы, что вечно хочет зла и вечно совершает благо."
"Фауст" Гете