Seriously all they need to do if they want cores to stay is lower the cost to masterwork.
Instead of the extreme progressive tax they should lower it to 1 core per upgrade and the community would be satisfied, given everything else stays the same.
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I don’t get one thing. They polished many aspects of the game at the end of D1, it felt great. If you have all that feedback and experience how you manage to throw all the progress away and -blam!- D2 so hard right now? It has to be a special talent.