Mend

At low levels, it does not work well, but use it anytime you think to use it. During fights even if you don't need it. get that thing moving, at 100 it has yet to fail me. However, I have died as a result of "you have worsened your wounds" so if you're gonna use it, use it at first 75% mark. It only goes up 25%. Currently at 200 BW, level 49, and it has NEVER failed to mend after I reached 101 master status on BW.