confuse/beserk is the big one because your physical attack characters can frequently one hit KO your mages/thieves or even each other. stoneproof is also a must in this game as I've seen some enemies either petrify all of my characters in one attack, or petrify one of my characters so they shatter(the thing in baaj temple does this) and can't be revived. I thought this had something to do with it being an underwater fight but then it happened to me in an on land random battle...