A Familiar Figure

Grey and Void didn't try to hide their whereabouts, since the person might be from the Gnome race and was probably after Grey, then they would kill a bunch of Sage Plane Elementalists from the Gnome race and try to lead the Elemental Venerable their way. This would give them the chance to assess the strength of the person before trying to engage such a person. 

With Void around, it would be almost impossible for someone to sneak up on the duo. Not just that, but Grey could easily sense those from the Gnome race, so as long as this person was from the Gnome race, he would be able to sense them. 

The duo soon started their killing spree, killing every member of the Gnome race they encountered, while also heading in the direction of the hideout of the Gnomes.