Board Thread:Episode Discussion/@comment-23712247-20160203074906/@comment-27312496-20160206034416

Here is an idea, going to be a bit scientific on this one. What if, unlike our moon, and more like the gas giant's moons, Remnants moon was a protoplanet that got caught in the planet’s gravity sometime billions of years ago. Within that moon laid a substance, or something, and at some point the moon ruptured (would have to have been after it solidified) and that substance rained down on the planet (surviving reentry) and crated the grimm.

