As Matron Ki'Willis considers the future, she remembers the path to the merchant company headquarters of L'Tarranen del Egluth (the company of the coiled whip).
Many years ago, when the company was first established with the partnership of House Morcane in Maermydrya and the financial backing of House Baenre in Menzoberanzan, she traveled this way before.
Then the Matron traveled in disguise with her then-patron Valence Kun, Marckarius, Narcelia, Quertus, Quertus' older brother Eilos, Quertus' younger sister Alaunirra, Alak Millithor (son of another of the Matron's sisters), and several commoners of no importance (Belgos, Durdyn, Guldor, and Rizzen).
From Mantol Derith they traveled around the Darklake to the strange plant creature Araumycos. Traveling inside Araumycos they went to a hidden portal that had been constructed by Groomph Baenre. After speaking the password, the portal transported them 600 miles through the extremely dangerous Sharnwall on one side and out of the Sharnwall on the other side to a portal west of the Darklake. L'Tarranen del Egluth's company headquarters was a mere three miles from the second portal.
The War Trolls and many other slaves had traveled this route to Menzoberanzan over the years. If the slaves rememebered the password, they might be trying to travel home by this route.
But what alternative was there?
Traveling on foot through the buried realms would be fascinating. The ancient magic of Netheril still existed beneath the surface of Anauroch. But the Phaerimm would be certain death for House Millithor.
Or, we could travel on the surface. L'Tarranen del Egluth has a tunnel to the surface in the area known as the Dalelands. Their exit was cunningly hidden in a supposedly haunted crypt known as the Dodrien crypts. To keep the supersitious locals away, they had a sentry post in the crypts and they also stocked the crypts with undead and traps. But in order to reach the crypts, the trip would be nearly 800 miles across the surface. And they could expect to be hunted by the hated surface dwellers every foot of the way. Especially in the desert of Anauroch where neither food nor water could be found.
Quertus's shadow walk power would be no solution for traveling through the Sharnwall. The Sharn's and the Phaerimm were powerful spellcasters. The way through the buried realms across the Shadow plane would be equally lethal.
Although, the shadow walk power might eliminate the danger of crossing the surface world and allow them to reach the Dodrien crypts without incident.
The alternatives are:
The portal in Araumycos and possibly coming to blows with fleeing slaves.
Or shadow walking acrossing the surface world to the Dodrien crypts. Until they found the sentries or the route underground, they would have to deal with undead and traps.