Huh some of the Warhammer fluff claims the copy of the Libre Mortis is capable of devouring the souls of any who read it and once summoned a daemon, which actually increase the value of the information within it pertaining to the undead due to it explicitly not leaking Dhar into the atmosphere whereas reading the copy apparently has serious issues of warp phenomena occurring. Having said that it would wise to not open it again until at least Mathilde has some actual Ulgu wards obscuring her home, and simply translating the information on undead into a form that is useful for those who fight against Necromancers will probably take a lifetime, or at least doing so in a manner that insures it won't be misused by necromancers will.
Sigh. Humans do not have the finesse necessary to simultaneously manipulate all eight winds at once, or rather they lack the mental capacity to multitask at 9+ things at once, which is what High Elves are doing* when they wield Qhaysh. The other issue is that relative to the Elves their soul are hilariously malleable when exposed to warp energy.
The advantage of having such a malleable soul is that it allows them to with enough time, and spark of genius to become similar to whatever wind they align with. This is how they can achieve immortality while remaining mentally stable/consistent, or at least extend their lifespan long enough that they'll die stopping the madmen who keep showing up to claim "the End is neigh!" long before it runs out. The downside is their soul can be altered in distinct manners when directly exposed to separate WoM, which is why even the act of swapping between two winds drives them insane due to the contradictory traits each wind inherently possess.
*Well technically they're doing so in a manner that has the individual components flow in a manner that produces a superior end product while simultaneously keeping them separate.
