Pigstep is somewhat related to the trial chambers ost in that they both have a clock ticking sound, does that mean the builders were in the nether? Yes. They made the wither effect to defend themselves and the piglins seem to be advanced in strategy when defending a bastion. Does that mean the relics found are also related to everything? Yes. The ancient ones built both the ancient cities and strongholds, the fossils were also part of their knowledge. The ancient ones also controlled all dimensions, and made Jean(the dragon) immortal. They also made the end cities.