Heres your free weapon

If you were dumb enough to buy Darksiders here you go
step 1 while in game enter the pause menu
step 2 select options
step 3 undergame options select enter code
step 4 enter the words" The Hollow Lord" using the keyboard entry screen. the code is case and space sensitive.select done.
step 5 the next time you visited Vulgrim, the Harvester will be availible for purchase from the weapons menu