Very interesting! WHO opened IT before? Now that’s the question!

Warning... heavy spoiler!

First, a clue. QC is about the same age as time of opening.

At that time, his father (universe badass) predicted his future and went all across the realm to where QC will be. One location was putting that sword so it shows up before QC, while here he took some and left other things so they show up only when QC can use them and not before. This is second one and thunder lake will be 3rd

btw. There are two more meddling occasions. He enforced the seal over realm to not break too soon and he shows up at river of time when QC sneaks into divine realm

XD