Antoshka,
when are you planning to take the first Chillwater dungeon?

the first dungeon (54/19) at level 115. Since we don't have the "mega-boosting" ability yet, everything will proceed according to the schedule :).

Then, to capture the Black Tent, you need two mega-boosted heroes - one to take the lower right dungeon, and the other to take the lower left dungeon.

7 boosts cost 7*2500 = 17500 - this is for taking one dungeon.
another 7 boosts cost another 17500 - this is for taking the second dungeon.
even if it's not 7 boosts, but 8 each, in total it's 40k.
after the drowns, we'll have 70k. I think if we don't waste money, we can manage :).
in principle, you can run from the first dungeon directly to the dungeon with the Black Tent. - BUT I calculated that it might be more expensive. Although, maybe not, something around 20 boosts :). Again, these are all details that need to be combined into a single picture.

So, I don't think your Stone Flower will work at level 115!

we can argue about this for a long time... :)