Vamprey..you may have missed my response earlier in this thread to that dia/bio comment ..its a few messages higher. I absolutely agree with you that in most cases, Dia > Bio, however on mandies that is simply not the case. Bio on mandies is much more effective, as dia on that particular mob class is not effective.
Go out and grab some mandies and test them out...go to West Sara and Dia a mandy and just watch its hp bar. Let it run out..the mandies hp should be about 3/4 full by the time Dia I wears off. Get a brand new Mandy and this time, Cast Bio I. By the time Bio I wears off, it will have a sliver of life left. Also compare the initial DMG from Dia vs Bio, the dia will hit for 0-4, the Bio for considerably more. Do it over and over, you will get consistent results.
Next consider a Mandie's defense..they do not have very high defense, nor do they cast any protective buffs on themselves (unless you count regen). They are highly evasive and they attack fast and with multiple hits..that is their strength...but if you manage to hit them, they go down very easily. Giving them a def down when their def is already quite low, when it is highly resisted, is less effective than the Bio would be. With high competition for mandies in those jungles, getting the mob to die the fastest is the goal, and Bio will get the job better on Mandies.
99% of the time, Dia is the better spell. But not on mandies. That BLM was doing the right thing in that situation to cast Bio. Casting Bio on mandies is a good choice. Cancelling that Bio by casting Dia over it, not a good move, and if he was insisting that they stack, well...lol...also not a smart move on his part.
Edited, Aug 20th 2006 at 2:59pm EDT by Birkietoo
FFXI: Birkie (75 RDM, 64 BRD, 56 NIN, 52 SAM, 50 BLU, 44 THF, 44 WHM, 40 WAR
Birkieblue (62 WAR, 60 WHM, 50 BLM, 48 SCH
WoW: Chambord(70 S.Priest),Deminia(48 H.Pally)