@mahtan thinking about it again, do they ever said that consuming happens only due to excessive mana pool?
it might be due to lack of magic control, paired with a lil' bit above average mana.
it's still sketchy that the nobles keep the recipe for magic tools a secret tho, if their claim is true, that only those with high mana (read: the nobles) can make it.
make it public, and either nothing happens, or the public find a way to make lesser version of it that could save lives.
really can't find any possible answer for that secrecy except to keep that contract with noble thing going.
which implies that people with consuming have some value for the nobles. which kinda contradict the possibility that consuming happens only due to lack of magic control.