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I think Diminishing Returns would make a great asset and balance the game out a lot.
Diminishing Return (example): The more you crit, the less chance you have to crit. So if you have a 100% chance to crit, and you crit 5 times in a row, your crit chance would be reduced to 50%. Same goes for healing, the more you heal, the lower effectiveness of that heal. Lifesteal/Dodge/Parry..etc.