What, you may wonder, is this domain, you ask?
Every formidable demon possesses one. Angels, too, have their own domains, but since they never appeared in the novel, the distinctions between them and demons were unknown to me.
A domain is a realm of enigmatic confines. Specifically, Selgaath's is known as the "Ethereal Nexus." Within its bounds, the very fabric of space and time blurs and melds into an intricate dance.
In these dimensions, reality itself remains in a constant state of flux, giving rise to unpredictable battlegrounds.
The Nexus pulsates with an eerie luminescence, casting an otherworldly aura upon our surroundings; It's somewhat akin to outer space but with a more arcane essence.
Within this arcane setting, battles are heavily influenced by the peculiar properties of the specific domain. In this instance, its primary ability is to hinder the activation of spells, imposing an additional one-minute timer on every incantation.