The blood-colored vortexes in Blood Sea's eyes were due to the Blood River Path's ultimate arts—the Netherworld Tribulation Eye. It was an unrivaled martial technique that allowed one to see through the profoundness of how everything in the world circulated.
With this remarkable technique alone, his comprehension of martial arts was at least ten times faster. His efficiency of restraining his enemy and emerge victorious, looking for the opponent's weaknesses, and finding ways to nullify various sects' and factions' martial techniques was also surprisingly great.
At this moment, when he activated the Netherworld Tribulation Eye once again, he was able to see through the layers of steel walls and sense that a man was seated cross-legged in the palace hall.