Defenser (3.5e Equipment)
From D&D Wiki
Defenser: This pair of identical masterwork adamantine Longswords has been crafted with a single thick blade edge, a broad covering knuckle guard, and a comfort grip. When fighting dual wielding the swords, the user gains a +2 deflection bonus and a +2 shield bonus to their AC. These swords also have double the hardness of normal longswords. Due to their design, they are also 50% heavier or 1.5x the weight of normal longswords.