I also recoeved rough hewn axe as tier 10 reward on difficulty 2. I managed to get it firet try, it was in chest 1.
Well I have hade the following purple items on difficult 2.
Lv 5 Kelossion hamer
Lv 10 Kelossion hammer reel
Lv 15 Cooper Dugel.
So doubtful rewards are the same.
What really sucks is that I determined that the items' locations are different. That means that even if your rewards are the same as another person, they're not in the same place as yours...
For example I opened the third chest of tier 15 because someone else told me that he got the purple item from there, but instead I got the crappy blue axe...
I have 7 or 8 different SS in grand challenge.
The cost to open a chest with a random luck for loot/SS should be reduced. Merchant store charge 40 gems per SS.
Here it cost 100 gems and it is not guaranteed you will open the right chest. That is very unfair. It should be revised to 20 gems or less.
This will encourage player to use gems to try their luck more often.
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If the loot is good like moonglow or Wizard Hat etc, then 100 gems is okay but atm, Ucool should not charge 100 gems at difficulty 1/2.
Way too expensive.