Well, you're still able to get more ess crafted with Ghraak. But yes, you can use a Lurker if you abyss cosmics. Yeah, but since you earn about (149x2 - 121) 177 gp per essence with cosmics and about (225 - 121) 104 gp per essence with natures, and can craft 7 more essences per abyss run, double cosmics are better money anyway. :