Seem to make sense to have these useable by outcast PCs or at least by Druids as she does offer a special shop via dialogue check for Druid Class. Perhaps non-druids can pay a fee to use them? NPC is the Sandstone Caves in the zone directly to the left of the Gate of Roses when exiting the Krak.
(https://i.imgur.com/yQFn83h.png)
These summon monsters sometimes, so probably unlikely. Nice idea though