NPC chatter in Vektor implied that exhausting Number 024's MP would prevent it from using Wallchange. After spamming Rasp to the point that it didn't have enough to cast its level 2 spells (the game announced it had no mp) it was still Wallchanging. I just proceeded to beat it down from there. Just to be safe, I rasped it once or twice more just to be sure if something would happen. To be fair, this DID make the battle somewhat easier in that it lost access to about half its dangerous spells, but I can't help but think I'd have had an easier time just focusing on taking it out in the first place.
I just wanted to bring this up, because I might have misunderstood what the chatter was meant to indicate, or that might be some leftover text that no longer applies.
Or this might have just been a clue on how to deal with Magic Master, that's also possible.