NightWind
The only thing that bugs me is that he traded 12 spell books that could have had completely unknown to him or very rare spells for a lesser trait. I at least wanted to know if it was easy for him to get those 12 spell books in safe zone 1 so then it wouldn't be a loss for him to trade the books for the trait.
While behind able to instakill 3 people instead of just 1 us cool and potentially live saving, could he not have used the durability rune on the cancelation rune? Says it had one use, so make it 3 or more, and then could he use it on the locked keyword of his trait? Instantly unlocking it, then be able to stop delete the limited life span? And then use it elsewhere as needed, to basically cripple or kill someone, or help someone else.