User blog comment:Supahbadmarine/By Tzeentch! Here We Go!/@comment-4608429-20130211210907/@comment-3258762-20130211213626

Why not just have the Forgotten Zone nulled?

Malcador could toss a moon into the Warp and keep it safe, then I bet the Emperor could make a sector invisible in the warp.

The Primarchs would be the same, but until they left, they would not be seen.