an amethyst in helm can help you clear rifts faster yes... if you don't have to run away just to not get killed as opposed to a ruby which will not make you clear anything faster... 4.1% is just the xp you gain nothing to do with dmg.
i'll give you the best and maybe even simplest advice, get nagelring and don't let it go for a while. you can pretty much clear T2 with it, that is how i did it. cleared entire campaign and cruised through hard and master difficulties and went up to T2 if i remember correctly.
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an amethyst in helm can help you clear rifts faster yes... if you don't have to run away just to not get killed as opposed to a ruby which will not make you clear anything faster... 4.1% is just the xp you gain nothing to do with dmg.
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i'll give you the best and maybe even simplest advice, get nagelring and don't let it go for a while. you can pretty much clear T2 with it, that is how i did it. cleared entire campaign and cruised through hard and master difficulties and went up to T2 if i remember correctly.