If you can tell one Geister from another, you can put them in a group. Also things directly related to the Geister should go here.
“According to Lady Vrin, Loremistress Milvistle was a Geisterdame who doubted the divinity of the...Loremistress Milvistle
“The Geisterdamen speak a language that one might term "Geisterspeak" or "Geisterese." It is...Geisterspeak