In Dwarven myth twins are sacred.....

Six-thousand years ago, in the Dwarven nation of Brega, on the world of Relata, the great dwarf King Sulakaaneer's wife became pregnant and his physicians informed him she was carrying twins.  The event coincided with the dwarves finally breaking to the surface of their mountain and setting eyes on Relata's twin suns for the first time.

To commemorate the events, the great and mighty Sulakaaneer used his great power to bring down Relata's lesser sun, that his master smiths might harness its power and forge two swords for his heirs. The long-swords were named Day and Break.

He named his son's Brotom and Bretom, the two did many great deeds in their father's name, with their magnificent swords. But on his death, his sons fought over the crown, leading the dwarves to their first and only civil war.  The brothers finally agreed that the war was only harming their people and agreed at last to a duel.  Both brothers fearing each others strength poisoned their blades in secret.  As the duel began they traded blows and superficial wounds, the poisons spread through both their veins, leaving the brothers dead and the bloodline of the ancient kings severed forever. 

The other dwarven nobles gathered the two blades, Day and Break, and sealed them in a massive golden coffer, setting it on a high place in their vaults,  intended to be a reminder of what happens when blood turns against blood.