My cheesiness knew no bounds however. At some point I acquired a shuriken, which would increase your total HP by 1 every time you equipped it. I did the righteous thing and spent a few more nights unequipping and equipping it, which left me with some outrageously high HP.
Feeling that even this munchkin level insanity wasn't enough I fiddled around with the save game and figured out how to clone my character. Finally my party had a front line of 3 ninjas with unassailably high HP totals. Finally, Werdna was mine.