Hi all heroes,
Maybe you don't know, but most powers and upgrades values are dynamic. They depend from skills and abilities levels.
Here are the main abilities effects :
So, for example, if you want to increase your heals efficiency, you can focus your training on intelligence. Restoration skill (autotrain on casting) will improve the efficiency too.
Here is a summary of the powers dependencies (will be in the next manual update).
Not all upgrades and upgrades values are the same. They mostly depend of the base class chosen