Keth says, "My vision is Elamshin, for it is the will of the Quarvalsharess, that I undertake this venture. The guide is willing to show the way til the end of the quest, in exchange for a small extermination service. That will be our first stop, afterwards we head to Maerimydra, and one other place, until we start I would rather not say more."
"If there are any last items you need, you should try to acquire them in the next couple of hours, before our guide comes to collect us."
"Also, some darkoil might be needed, since Maerimydra in ancient times controlled part of the surface world, so our journey has a good chance of venturing into the vile ssussun world of the darthiir."