Entiselle

Entiselle is a fictional substance featured in speculative fiction and tabletop role-playing games. It is described as a rare crystalline material with unusual energy interactions, often used as a power source, a catalyst for advanced technologies, or a trade good with restricted extraction.

In different settings, entiselle crystals vary in color and lattice structure, but common elements include energy absorption and luminescence. Some depictions claim it can alter electromagnetic fields or store vast amounts of energy, while others portray it as volatile or reactive under certain stimuli. The exact properties are defined by the author or game designer and can differ between works.

The origin of the term is a neologism created by writers. Etymology is not consistent across works; entiselle is sometimes linked to fictional languages or cultures within a story world.

In-universe provenance centers on remote or hazardous environments, such as deep planetary crusts or asteroid belts. Extraction tends to be dangerous and expensive, contributing to its status as a coveted resource and often shaping political or corporate conflict.

Beyond world-building, entiselle has been used as a plot device to explore themes of resource scarcity, technological dependence, and the environmental impact of mining.