Because this name appeared in the original storyline.
That was in the later stages for Yuan Tianyi, when she had countless Demon Beasts under her command and had become a prominent figure across the entire Demon Beast continent.
At that time, Yuan Tianyi was extremely powerful throughout the entire Demon Beast continent, but she suffered a heavy loss at one place and couldn't find a way to take revenge.
That place was the Nine Netherworld Abyss.
And the one who caused Yuan Tianyi to suffer was Lin Yuan, the master of Nine Netherworld Abyss, whose true form was a Hellfire Red Lotus.
Why did Yuan Tianyi suffer?
Because all those Demon Beasts under her command, whether they were high-level Demon Beasts, or her signature Holy Beast Moonlight Unicorn, would tremble in fear at the sight of Lin Yuan, completely incapable of fighting.
Though Lin Yuan was said to be the master of Nine Netherworld Abyss, he was in fact the master of all Demon Beasts.
