When maxed, it allows you to use a couple of potions that provide benefits like Major Ward/Resolve. Unfortunately, I believe it it has been bugged since beta so that it only works with some character…
Back when it reduced the potency (and not the duration) of negative effects on potions you used (by 25, 50, 75 and 100% if I recall correctly), it actually had some uses as you could use ravage healt…
That is the only crafting passive I have 0 spoints spent <img class="emoji" src="https://forums.elderscrollsonline.com/resources/emoji/lol.png" title=":lol:" alt=":lol:" height="20" />