The Dink Network

Yeah, healing potions are pretty important. It's quite possible to defeat him without them, it's just very hard. Furthermore it's important to be a little patient (not too much though), so if the Scourger starts to count, get out of the way. And try to avoid everything that looks like it could hurt you (the flames).

Furthermore, I noticed that very early on in the battle there are far less flames, so try to strike him early on a few times. There was a good Dutch proverb about this...