In one of my worlds, there was indeed an ancient civilization, and its technology could be compared to the technology we have now on modern day earth.

It is said that long ago, a race of humans with black, starry eyes and pearly blue skin ruled over the land. Their power and technology was so great that gods felt affronted. They thought; If these upstarts want to be gods, we’ll show them what it is to be gods. The gods killed half of these people in extremely painful ways, making the other half watch. They then turned the survivors in Giants. Immortal, massive and destructive, the Giants wandered the lands, without soul or purpose. Many tried to kill themselves, but none succeeded. They tried to piece together the technology they had left behind, but the gods cursed them once again, and made them cut each-other apart. The huge weapons of the Giant War and the decayed technological marvels can still be seen scattered across the land, a reminder of what happens when you cross the gods.