Ancient Titans

The Ancient Titans are a species believed to have existed long before formal documentation. However, many informal sources of documentation exist, having survived millennia. These include cave paintings, artifacts, folktales, and time travelers.

The titan species may still exist, and might simply have stopped visiting our dimension when they had fully extinguished the prehistoric chickens, which they found delicious.

The Formal Documentation
The origins of the Ancient Titans have never been confirmed. Paintings often depicted them walking out of holes in the air, leading historians to believe that the Titans were an extremely advanced species that had mastered the act of Dimensional Travel.

Paintings also depict titans throwing projectile fire from their hands in order to slaughter their prey. Nobody is really sure what this means, whether they could throw fire from their hands, or had invented some weapon to do so, but since we don't deal with titans anymore, it's questions like these that historians try not to dwell on for too long.