Mental room and Ether conundrum

"What do you want my help with?" Zamia asked after trying to think of a safer approach for Eldrian. Even if he could and would resurrect, the mental pain from continued failed casts was not something trivial. Zamia knew of more than one mage who had turned senile due to it. 

This also was not just something static mages had to deal with. Even Alicorns faced this problem when tackling advanced spells and magics.

And in their cases, failure was far more severe as the energies would go completely haywire and likely kill them if they had attempted something too far ahead of their level. They were not working with a spell module after all.

The advantage of the spell module was, if it was completely wrong then their mental energies would be the only backlash; unless they were dumb enough to cast it before confirming it was stable, as Eldrian was doing.