The surrender wasn't great; there were a lot of boxes, but up to level 117, there were only 2 hives and 1 hidden lair of vipers. The red gates were active, there were no artifacts, and life block was also hindering progress. But from levels 117-121, I managed to find 2 more lairs, as well as a level 2 conserve, and a couple of boxes that helped a lot, giving 15k experience and a Thaz with experience and advanced tactics, and 15k gold. I built levels 1-6 with a castle.
On level 123, I defeated the dragons, and 1 angel, 2 vipers, and almost all the wasps dropped. I maxed out mass haste, and moved into the central Inferno. I was planning to attack the Utopia in the center on the next turn and upgrade 30 vipers, but the opponent surrendered due to the red gates. Thanks for the game!