u/Flashy-Comparison-30

Hello, my two Sons have been playing the game for a couple months now and I have a question about battles and costs to enter. One account is 45, and now every every new battle is 750k coins, while the other account is 43 and the battles have a wide range in cost but most are in the 150k range. Is this just because theres a difficulty jump when he got to level 45? Also, the 45 account got the Scorpius quest, but the 43 account got an Indom Gen 2 quest, though I think he was a couple levels lower when he got it. Anyway just wondering if its the levels that causes the jumps because their creature strength is pretty close. Thank you in advance