The Skullcleaver is the most powerful weapon in the game. It is made entirely out of Nether body parts.
The Skullcleaver can be obtained through the Order by trading in Nether parts throughout the game. The Parts required to make one are: 2 Crawler Spines, 2 Nether Bones, 4 Nether Claws, and 3 Mantis Membranes.
Damage: 530 Weight: 6 lbs Space: 10