Demons
"Now everything changes." Seth said as he looked at his companions. "The fact this is one of the Relics of the Convergence basically confirms our doubts about our origins."
"Do you really believe we are creations of the Titans?" Levi asked with a strange expression on his face.
"We are not their creations, but the children of their creations. If the most precious object of the tribe, which only the First Elder, the strongest of the tribe, can use, is one of the Relics of the Convergence, then we probably got it from a Titan.
This explains our origin, why we are so powerful, and the motivations of the old elders of the tribe.
They were creations of the Titans, so they wanted to keep us away from those who began the hunt for their creators, the Titans. That must be the reason for our isolation.
So we no longer need to look for giants to understand our origins," Seth said, dealing with the truth of all this much more easily than his companions.