Is not gutting dark mind, you still receive 20% mitigation against magic attacks while and added 10% mitigation against phisical attacks, then again DrK already has lots of mitigation so is a bit overkill.

I like the job idea, if anything i would make so FoS gives 30 sec of darkside while EoS gives 15 sec to have a faint darkside management weaving between the two in single combat.