History and specifics
By the 2260s, the planet had somehow regained enough atmosphere to produce bands of clouds with lightning storms. Its surface temperature averaged -120° Celsius. A white powdery-fungus or lichen lived on rock formations and deposited extremely jagged crystalline minerals as it grew, similar to a lifeform on Trager III.
In 2264, the planet was orbited by the starship USS Enterprise, IKS Vengeance, and a warp 15-capable vessel tracked from the Large Magellanic Cloud. Norinda from the vessel proposed a mountain-climbing contest to take place on Mandylion V, with the prize being her vessel. Unaware that she'd already chosen her winner — a Romulan starship cloaked in orbit — James T. Kirk agreed to the contest, allowing expert mountain climber Lieutenant Hounslaw Tanaka to compete against Lord Commander Kaul. Both climbers died during the ascent of a 300-meter mountain on the surface. (TOS novel: Captain's Peril)
- Given Spock's assessment that Mandylion V's new atmosphere contradicted all known theories of planetary evolution, it may have been created by Norinda, a proxy of the Totality.