here is a tip that gives u the most powerful party. There are 6 awesome weapons for about every type of character in the game.There is the weapon Two Together,Twinblade, rare/level 51. u get this from a monster called stare it is in almost every lvl. 70 dungeon.
There is also the minerva, longarm level 55/rare, this comes from a monster called skull devilangion which is also in any level 70 dungeon. The same monster will give u Tri-tips, heavy axeman level 51/rare.
There is phoenixs fire, blademaster level 55/rare. a monster called Lich gives u this item.Level 70 dungeon.
Also there is the Five Stars, heavy blade level 51 or 55/rare. this comes from the monster called star viking whichs in level 69 dungeon.this monster is the hardest to drain so u must use your weekest moves to break his guard (more effective if fought with only weak magic and no party).
Lastly there is the Heh Heh Heh, wavemaster level 55/rare. This comes from a monster called dark maiden in all 70 level dungeons.
U might have to drain these monsters more than once because they have other drain items too.just have patience.