i just did it

its very hard but heres how i did it
i ran to the right half way to the small balconey thing that overlooks the water at the skeleton in the middle as theres no poision there...
rested till healthy
Now im lucky as my warrioir can call up a monster who helped me eliminate the small guys around there with me just standing there(took a couple of waits while i had to recall him when he died)
then i called him up again ans while the guy with the bow started to shoot him i ran round the rest of the way and got to him as there isnt any posion again where he is standing
let me know how you get on
hope this helps
p.s.
my health is 285 and i wouldnt have liked to do it on much less