A containment unit, perhaps, or a means of sacrifice...

[His eyes follow that red ichor. It's a worrisome sign.]

While I can't say with certainty, the moon entry in the Convoy database does mention "The Breaking" as a pivotal event. Connect the dots, and consider the Moon Warps, and it's possible the First Impact was simply the very first time shards of the moon fell upon this land, sowing seeds of ruin.