My issue with the custom resist system is more with disable spells than DD. You simply need way too much MR here to even get to 90% (that 10% is still game breaking), which then prevents you from being able to stack CR or FR to deal with other classes. If MR was classic, then you could stack CR or FR and have the custom resist system where nukes are still partially effective in a way not to completely neuter casters.
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