is rudeus and eris blood related

He conjured a gas mask and metal canister from his ring, alchemically-formed, as was the carbon monoxide within. Any time the two brothers separated, Noah would creep up beside Falco and spray him with the gas. Odorless and colorless, Falco was completely unaware, mistaking the air on his face for the wind, with Noah using his mana to conceal the sound of the gas being released. It wouldn’t leave lasting damage, nor was it a threat to the crowds, but the more Falco breathed it in, the weaker he became.

The fights continued, but they were becoming more and more drawn out. The weakest combatants had all been culled in the first three rounds, and now the remaining warriors were going at it with everything they had. Eventually, Noah’s first target entered the arena. He was a young man, spirited and garbed in plate mail, having won his fights with hard-won determination and effort. His name was Falco. Noah followed him outside, the warrior unaware of his presence. On the other end of the ring, his opponent arrived, another man, a few inches taller and years older, wearing dark clothes and an amused smirk upon seeing Falco. Both were brawlers, entering the ring without weapons.

His movements slowed, and his water magic flickered like a candle at the end of its wick. Regardless, he powered through, and after several minutes of relentless combat, he delivered a critical blow, punching Viktor in the chin and sending his brain rattling around in his skull. He staggered back, using what little mental capacity he retained to stay upright, while Falco hobbled over, his strength fading. He and everyone else simply assumed his condition was due to fatigue.