The crypt

What Belialthorn saw on it made his heart skip a beat. Right there, below, written so small it was his Demon eyes that allowed him to see it was runes.

It was what was popular in Aetheria instead of glyphs. Kat told him about it and they saw it a lot in Twilight.

It shouldn't be here. Everything of the old world before the system came had been wiped clean. Should be wiped clean. But here he was holding one.

It didn't make sense. And yet it did. It must mean only one thing. That crypt must be linked with the system or there are other people from off earth.

Either way, this had just become dangerous.

Or maybe it was just a crypt with advanced monsters who were provided with such weapons by the system. Only one way to find out.