Ilanthila

Ilanthila is a fictional gemstone of high value and often symbolic importance in fantasy literature. It is typically described as possessing unique optical properties, often involving the manipulation or emission of light and color. Specific details of its appearance and powers vary depending on the author's creation.

The term "Ilanthila" is primarily associated with the Lyonesse Trilogy by Jack Vance. In Vance's works, Ilanthila are gems of immense power, integral to the magical systems and social structures of the Elder Isles. They are difficult to obtain and work with, and possess qualities like storing and manipulating light and energy, as well as playing a role in memory and identity. The Ilanthila in Vance's creation can be used for both constructive and destructive purposes, highlighting the moral ambiguity often found in magic systems.

Outside of the Lyonesse Trilogy, the term "Ilanthila" is occasionally adopted by other fantasy authors or game designers, generally referencing or alluding to the properties established by Vance. However, there is no established canon outside of Vance's usage, allowing for diverse interpretations when used elsewhere.