Sorry if this topic may seem a bit misleading (I have no current info yet), but I've overheard that via Banish (and an unresisted Banish most likely) you can test the MND of an HNM, by seeing the static damage it does in relation to the mobs MND. No I don't have any info on it myself, but I believe it was Janice who mentioned it can be done. Is there already a formula out there? Like such and such mob takes XXX amount of damage from Banish III when MND is a certain amount.
If not, I was thinking if you Banish III'ed someone in Ballista, if you can determine through that and comparing how much an ES Banish III does to say Tiamat, you could determine his MND. (obviously taking into account the -50% Magical damage taken.) I'll be testing this shortly in Ballista, so maybe I can come to some conlusions.
P.S. Basically this came to mind when recently alot of people have been figuring out that Slow is indeed not a static percentage, but based off of MND. May be OFNs, but I know alot of people within my LS and others found this to be something new.