Don't forget, she has to bang her head. And "something else" has to affect her magical abilities.
I understand and accept!
The Erdtree,
Laurelin and Telperion,
Yggdrasil ... So far, the unnamed great walnut tree. The birthplace of the race to which our three sisters belong. It almost rotted away like the rest of the World after a catastrophe on a stellar scale - the death of the second star (Menelwen's brother) (was it accidental?) and its rebirth into a black hole (various religious mudslinging, omens, prophecies, etc.). "scandals, intrigues, investigations").
The rot is not simple. It is the destruction of the very fabric of the World, which is also not simple in its nature (smart particles, nanobots... any such stuff) on which everything depends, including magic.... If you remember, I told you that this is a World created by a posthuman/artificial Intelligence/God (here it is equivalent). All connections to "God" was lost and the creation process reversed. It was the "rotting" that almost killed Nada and it's what gave her more power.
Sorry for the meandering, tried to fit all my thoughts into a couple sentences