In the end, I spent the rest of the week running around collecting resources for efreets, and finally had enough. Decided to break into one of the treasures, ended up choosing the one where I revealed a Pandora's Box with 50+ rags. The guard there was 20-49 upgraded snakes. I attacked at 121, but there were already 50+ of them, I didn't check, messed up. Only 1 efreet remained, that's GG. My opponent was doing quite well.
Thanks for the game!