This bizarre material is wrought by Chosen, Inspired and (rarely) kalashtar who use powdered crystal and the power of their thoughts and emotions, also drawing on the essence of Dal Quor. Sentira items are literally grown into their final form. They have an organic, whorled appearance, much like horn or shell, with a shimmering, opalescent surface. Colour varies based on the emotion used to create the particular batch.
Sentira is lightweight and almost unbreakable. Because of its resonant properties, it is an ideal material for emotional armour. For all other purposes, sentira is treated as mithral.
Sentira can be formed, sculpted, and repaired only by psionic creatures that have the Craft (sentira) skill. Such craftspersons, known in Riedra as thoughtweavers, must expend 1 power point for each day of work on a sentira object, whether building or repairing it.
Source: Secrets of Sarlona (Page 135)