To be honest, Roy was shocked when he heard Mephisto mention the name 'world-soul titan'.
It was because the first figure that popped into his mind was Sargeras.
If Trag'Oul, whom Mephisto called a world-soul titan, was really a titan on the same level as Sargeras, then it would really be troublesome.
But then Roy returned to his senses and asked curiously, "Mephisto, you know about world-soul titans?"
Yes, this was what Roy found strange. After all, the name world-soul titan should be from the Warcraft world. Other worlds shouldn't have such a name. Had Mephisto been to the Warcraft world?
"Of course!" Mephisto smiled strangely and bowed slightly to Roy. "Young Demon King Osiris, the one in front of you now is one of the oldest demons of the Abyss. My knowledge is more extensive than you can imagine."