"PIERCE, wait," Cyrus Helion said, then he grabbed Pierce's shoulders. The knight was standing in front of him, so he used him as support when his legs lost their strength. "Meeting Lucius hyung-nim always drains my energy. That's why he's so scary."
He meant it in a literal sense.
Prince Lucius Helion, the oldest son of the emperor, had a terrifying power. The First Prince could absorb all the Mana around him, consciously and unconsciously.
That was why Prince Lucius' Mana Core was sealed.
It was also the real reason why his older brother had a weak constitution.
"Even though Lucius hyung-nim's Mana Core is already sealed, he still unconsciously absorbs the Mana around him," he said. "It's terrifying."
If his older brother's Mana Core wasn't sealed, he would have drained Cryus's Mana.