All the NB passives are magicka and stamina agnostic except this one. Is there some way to throw magicka a bone for this one? Minor Prophecy maybe?
WITH AN ASSASSINATION ABILITY SLOTTED
Increases damage dealt by Critical Damage done by 10%.
Dealing Critical Damage grants you and your group Minor Savagery, increasing Weapon Critical Strike rating by 1320 for 20 seconds.