Innate Axiom:This set is not buffing Power Lash (nor, I believe, does it buff Assassins Will). It only buffs the original skill.The tooltips for Sun + Innate:Removing one piece of Innate. Note the Power Lash tooltip only drops by less than 100, which can be explained by the loss of magicka:So to isolate the test results, I did damage to a test dummy first wearing only Innate Axiom 5 piece:I then removed one piece of Innate and replaced it with a random piece with the same quality/enchant to normalize magicka:Note lack of difference in damage for the power lash, even though the initial whip has increased damage. This will also have the effect of reducing the healing from Power Lash.