Ghost Spiders are the giant pale white arachnids that the Geisterdamen use as mounts. This is the reason Geisterdamen are sometimes referred to as Spider Riders.
When it (creepily) has to get there overnight Edit
These creatures can be used to transport a, although they have been known to as well. However, for the really big loads, Geisterdamen go for .
Not much else is known about these mysterious beasts, except that they probably come from the original home of the Geisterdamen, given their similar pale white appearance (see also Geisterdragon …and maybe even the ).
Other Uses Edit
According to the novel Agatha H. and the Clockwork Princess, the spiders produce a "juice" which the Geisterdamen use to make a rather tasty cheese; this fact proves to be a source of queasy displeasure to Tarvek, who only belatedly learns the foodstuff's source. An offhand comment by Geisterdame Vrin in the same passage would imply that the spiders are at least smarter than cows.
Smoke Knights led by Madwa Korel, still loyal to The Other even after being kicked out of the Knights of Jove conspiracy, makes use of Ghost Spider venom as a main ingredient in six different "recipes", at least one of which is lethal when ingested, along with causing weight gain and/or bloating.