: Thrall are tireless- they don't need to sleep, eat,
: excrete waste, or rest; they just keep going, which
: explains why the fallen lords were able to conquer the
: west with armies partially composed of thrall. Also,
: if you remember, Rhi'anon does have a functioning
: world knot, which could easily reinforce the armies
: there, had the Thrall been around at the time.
It does not have a functioning world knot. Alric manages to make it work well enough for his purposes, but it clearly isn't workable in the usual sense.
Also, Thrall are slow moving. Even with continuing day and night until you got there, it would take awhile.
Seraph