Well yeah if you played the warband version of SoD the Antarians follow The One.
This is pure bullshit though. I played as antarians many times in Mount & Blade and each time they followed the void and they mercilessly slaughtered the population of calradia time and time again.
Also seeing as this "Empire" is led by RandomDude, an ex-fallen, and he found in Ichamur some seriously evil scrolls, it makes sense that his empire follows The Void.