Who is spying on us, and why?

This week marked the conclusion(?) of the adventure guide coin quest chain, with A Curious Coin.

Quest text here: https://i.imgur.com/FvFNbAb.png

The Shadowscrawled Coin that we receive says this in the tooltip: "The coin has an otherworldly feel to it. Its face is creased with dark purple and blue lines of magical energy."

Interestingly, there is one other Shadowscrawled item in the game, the [Shadowscrawled Tome](https://www.wowhead.com/item=164942/shadowscrawled-tome) added in patch 8.1.5 Brawler's Guild. It was written by Shadreen, a void ethereal, instructing Xan-Sallish to watch us.

Are The Void Lords observing us? Could this be a possible hint for The Void expansion, or even for the ending of DF?