so it's one by one
at least there is 1 houre between them so you should vote for the first choice.
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I did one level at a time for both heroes n it's already max for quite a long time so it works for me.
Option 1, as it is the only option that allows both heroes to be upgraded concurrently.
If u can't have them upgraded concurrently, prioritize queen.
Upgrade them by 5 each time, that way you upgrade their abilities. Good job for getting them both to 20, I know it can be quite a grind! Good luck!
Opps, thks, let me enlarge what I am referring. For lower level you can do it, but when you hit 20 and above I will upgrade a hero at a time. Thats means that while one of the hero is in process of upgrading, I will carry on and farm till I have enough dark to upgrade the other one.