Temper Ectoplasm( Ghostwalk, p. 39)
You can make durable equipment out of ectoplasm.
You can shape available ectoplasm into a facsimile of nonliving material, such as stone, crystal, or iron, or anything that can be shaped by the Shape Ectoplasm feat. For example, you could make a suit of half-plate out of ectoplasm and it would function exactly like normal half-plate. It takes 1 full round per pound of weight of the object to craft it, so a suit of ectoplasmic half-plate takes 50 rounds (5 minutes) to shape. You must make an appropriate Craft check to shape articles requiring a high degree of craftsmanship (jewelry, swords, and so on).
The material is obviously formed of ectoplasm and lasts for a number of hours equal to your Wisdom bonus + 1. Tempered ectoplasm has all the properties of raw ectoplasm, except that it lasts longer and it maintains whatever form you mold it into.