Blackguard

Blackguard is a one-handed sword which provides a bonus to both stamina and chance to parry. It was a favorite weapon for dual wielders to use in their off-hand in classic WoW.

Source
This item is crafted by Blacksmiths with a skill level of 300 who also have the Swordsmith specialty.

The components are:
 * 6x Lava Cores
 * 6x Fiery Cores
 * 10x Arcanite Bars
 * 6x Dark Iron Bars
 * 12x Guardian Stones

The plans are sold by Lokhtos Darkbargainer in Blackrock Depths. You must be Exalted with the Thorium Brotherhood to buy this pattern.
 * Plans: Blackguard