Petrichor V

Petrichor V is the primary setting of Risk of Rain and its sequel, Risk of Rain 2.

A mysterious, uncharted world, this planet was first set upon by humanity when the UES Contact Light was asked to go towards the planet by an unknown individual. The violent sabotage and crash of the Contact Light, as well as the subsequent struggle of its surviving crew, serves as the premise of Risk of Rain 1.

After the events of Risk of Rain 1 come to pass, a rescue mission is called in to determine what became of the Contact Light. The endeavors of the crew of the UES Safe Travels to explore the planet and search for answers serves as the premise of Risk of Rain 2.

Description
Petrichor V is a diverse world, with a wide array of environments ranging from deserts, tundras, fungal jungles, islands floating freely in the sky. Beyond these areas, the planet also sports a hefty variety of otherworldly realms, ranging from outright hellish to dimensions beyond common understanding. It is orbited by its moon, where Commencement is located.

The fauna of the planet is as equally diverse, and yet near-totally united in their violent hostility towards the crew of the Contact Light. It was no sort of territorial dispute or desire to scare off the Contact Light's survivors - the monstrous denizens of the planet relentlessly pursued them. There were some who attempted to document the native life, observing peaceful and gentle creatures who would turn savagely violent upon seeing a human. The signal echoes from Rallypoint Delta - the closest thing to a human settlement - describe the futility of their attempts to regroup in the wake of the planet's wrathful inhabitants. By the time the UES Safe Travels responds to the Contact Light's distress call, it is unable to find any trace of surviving humans left on the planet, and the members of the Safe Travels' crew find themselves met with the same hostility by the planet's inhabitants.

Trivia

 * Petrichor is the name of the earthy smell produced by rain after a dry period.
 * In planetary naming convention, planets are designated by the name of their star followed by the Roman numeral of their orbit's position in the star system, counted from the star outwards. Following this convention, Earth is named Sol III. Likewise, Petrichor V would be the fifth planet in the planetary system of the star Petrichor.
 * 'Petrichor V' was originally a name given to the planet by fans, based on a track of the same name from the Risk of Rain 2 Soundtrack. It has since been officially adopted as the canonical name.
 * Prior to this, the developers had used 'The Planet,' for simplicity and ease of access during discussions.