You confirmed that the Relic, when paired with Weapon Patterns, allows the user to reach through time, rearranging memories into weaponry. There's no telling what else it can do in the hands of a powerful entity like the Witness.

Ikora posited before that the Relic caused the temporal wounds on Mars's surface. You believe she's right, and that the Witness used the device to learn about the planet's Golden Age and Collapse, leaving Mars irreversibly damaged.

Your report states that the Weapon Patterns you used are essentially Darkness-infused "memory road maps" to the weapons the Relic creates. The Osmic Fragments are a weaker, incomplete road map—but with enough fragments, someone could build the equivalent of a Weapon Pattern.

The Relic is clearly capable of anything from creating weapons to tearing the fabric of reality. If Immaru gathers enough Osmic Fragments and finds a way to approximate the functions of the Relic—perhaps by using the runes you discovered in the Throne World—there's no telling what he might create.

In the meantime, there are other angles of investigation to consider. Check the other Hidden reports for more leads.