Ya that sucks, I always enjoyed stealing that stuff because it was such a challenge, you really couldnt run in there half-assed to do it. Had to equip everyone with 108 gems, possibly Judo Outfits to prevent instant death, make sure you have a way to reduce his Brave level, possibly a knight/dancer to hurt his MA/PA so he cant do that much dmg, and a way to quickly kill the assassins before they do too much dmg.

Oh well