I can't figure out the Pantheon Stairway. I've been cruising along and now I'm trying Level 500, and suddenly not able to beat it. I saw that the enemy team's stats are significantly higher, tried a few different team combinations, and finally decided to come back after the new week as I had more guys with that would have that blessing. Also figured that gave me time to level up more guys, and raise my stats in the Market. I went back this morning, and now that enemy team stats are even higher. So, even with the increases, I still can't beat it.
I'm not sure what I'm supposed to be doing, or if there's any point trying if the enemy just keeps increasing their stat when I increase mine. I'm probably missing something obvious. Advice?