Originally posted by Chef:

The 3rd boss is the real challenge unless you cheese it. The others 1.2.4 and 5 all fall to arrows.

No need to cheese the 3rd boss, is a simple tank and spank with an iron mace. Dead in under 3 minutes. He's only hard if a player doesn't understand the concept of damage types/weaknesses and/or stands in poison clouds. People fighting him with weapons he's highly resistant to is why some people mistake him for a challenge.