Vegnagun was a piss-poor end boss. They should have made it a pair of Timberland boots; that would have had the same effect and appeal... *rolls eyes*

Sin kicked ass. He terrorized almost every island/town and took numerous lives. It has a history that goes into farther depth than Vegnagun's. Sin could ahve knocked a Tsunami at BVegnagun, knocked it into the ocean, and therefore Vegnagun would ceese to work with all of that water running over it's body.