The two succubi who suddenly appeared were none other than Lancelot and Kalalin wearing Transformation Rings.
There are many types of magic items, with a myriad of effects, but the most common are those that have a fixed spell. The production process is very similar to that of creating a Magic Scroll, except it is more like micro-sculpting rather than writing, so as long as it is within their capabilities, Scholars are better at creating magic items than Mages.
Transmutation Spell is a Second Circle spell, and Kalalin had no problem handling it. The casting medium involves part of the body of the creature one intends to transform into, and they used hair provided by Tijana.