No, you're all wrong...kind of.
THY most damage award goes to cleric....not wizzard not bard not w.e.Cleric.The offering series, and especially pure offering you get at lvl 80 does massive ammounts of damage.with a decent 72+5 rod you could probably 1shot a full str(i wonder if full sun would still die 1hit

).Problem is, it's a kamikaze skill and you are left with only 5% hp(thats kinda 150-200 hp) so it's only good if you run out of choices...Ah, and your hp has to be full to be able to use it...
To get to the point, you're looking for a wizzard.massive ammounts of damage with all skills, and with a life control skill(which halves your hp but gives a great magic damage bonus) you would do insamne ammount of damage.Again, problem is it kinda gets 1shot even by people 3-4 lvls below

. But i still

my wizzard

.