Tempest's blessing

Tempest's blessing was a type of parasitic fungus that grew on the planet Nyriaan.

Description
Tempest's blessing resembled a fine gray dust and grew on exposed skin, living in symbiosis with a host organism. The fungus increased the visual acuity of the host, but resulted in an unpleasant body odor, hair-loss and doubled the required liquid intake of the host. The fungus could be removed through bathing and scraping, and was also vulnerable to white light, with prolonged exposure of more than an hour fatal to the parasite.

The native Nyriaanans would sometimes use tempest's bessing in their purify rituals and would apply the fungus's spores to their bodies.