Originally Posted by Buster Wolf

At what point should one stop doing 2-1 for farming and go for stage 11+ based on their team (I stopped at 8-2 since I heard it's a big spike in difficulty)?

Also do the Big Bloomdragon only drop in Advance or can it drop in the lower difficulty?

The 100 Dragons can also drop in the Intermediate Stage, but with really low rates, like really low. It would be wise to just do the 80 Stamina one and retreat with the first 3 chests, if you are sure you can't beat it.