Elbaf, Underworld.
Snow and ice blanketed the vast land, while the biting wind howled across the empty ice fields like ice-tempered blades.
At the very center of the ice field, an earth-shaking battle was underway.
An Ancient Giant over fifty meters tall gripped a giant sword thicker than the main mast of a small pirate ship, facing off from afar against a black dragon as massive as a small island.
Its enormous wings spread wide, blotting out the sky and completely blocking the already dim daylight. Its pitch-black scales seemed forged from the hardest steel, gleaming coldly in the wind. Its vertical pupils brimmed with the arrogance and savagery unique to a black dragon. Lightning gathered wildly within its gaping maw, crackling through the surrounding air under the high-voltage current as visible ripples spread through space itself.
"[Thunder Realm]!"
Loki suddenly unleashed a massive bolt of lightning thick enough to pierce through a mountain. The instant it flew forth, it exploded into a giant lightning sphere hundreds of meters across, threaded with black-red Conqueror's Haki Coating lightning as it slammed viciously toward Harald.
Facing his own rebellious son's merciless full-power attack, Harald showed no trace of panic.
He gripped the giant sword's hilt with both hands. The muscles in his arms instantly tensed and bulged, veins twisting like stone pillars as he swung forward with all his strength.
Threadlike black-red Conqueror's Haki lightning trailed along the sword's path, letting out a shrill screech as it tore through the air.
When human powerhouses used Conqueror's Haki Coating, the black lightning they unleashed was only several, or at most several dozen, meters long.
But when an Ancient Giant like Harald, far taller than ordinary Giants, fully unleashed Conqueror's Haki Coating, his black lightning quite literally shot straight into the clouds.
Invisible, razor-sharp