Dark Iron Destroyer

Source
The Dark Iron Destroyer is crafted by Blacksmiths with a skill level of 300. This item can only be crafted at the Black Anvil.

The components are:
 * 18x
 * 12x
 * 2x
 * 2x

are sold by Lokhtos Darkbargainer in Blackrock Depths. You must have Honored reputation with the Thorium Brotherhood to purchase the plans.