Chainsword
A Chainsword is proabley the MOST BADASS MELEE WEAPON EVER!!!! it's a fucking chainsaw sword for fucks sake!!. There is NOTHING more manly than hacking apart a Xenos, Mutant, or Heretic with a sword that sprays there blood and organs all over ie: INSTANT FERTERLIZER!!!! Also there are Chainaxes for the World Eaters to use to hack apart the servents of the corpse god!