You must be a vampire to be able to get this: if you turn into a vampire through 
the game, go to a healer in a church in any town and ask about the "cure for 
vampireism" she will tell you to go to a witch that lives somewhere in the west 
by a lake
eventually after you find the witch she gets you to get things to make a potion 
for yourself
after youve given her everything she asked for, she gives you 2 bottles of 
potion to get rid of vampireism but you should of been sent to see the mayor of 
a town so dont drink a bottle just yet!
ojnce youve given the bottle to the mayor he takes you outside down a secret 
passage way were eventually his wife will die, now drink one of the potions.
ask the mayor for a reward and he'll give you 500 gold if you ask him about the 
reward again he'll keep on giving you 500 gold for as long as you want! BUT SAVE 
IT AS SOON AS HE GIVES YOU THE 1ST REWARD SO YOU CAN ALWAYS RETURN TO HIM AND 
GET 500 GOLD