Mists

The Mists that have settled into the chasms are ever-present, and are very dangerous to humans. No one who has ventured into the Mists has returned alive. This is due to several factors, including the immense stupidity of pilots daring one another to "touch the Mist" and the presence of hallucinogenic fungus growing along the chasm walls.

The moisture in the air spreads the fungus spores, causing hallucinations, madness, and a mild cough. The disorienting effects of this psychedelic fungus causes pegasi and pilots alike to lose their way, lose their minds, and/or crash, generally resulting in the immediate death of all creatures involved.

The use of bridges or ziplines (pending) across smaller chasms results in skin contact with objects (like rope) that have been exposed to the Mists for extended periods. Something like our Earth's ringworm, this causes a sub-dermal fungal infection that is extremely itchy and unpleasant, in addition to being contagious and often associated with violent insanity. This infection generally starts in the palms or wrists, spreading in a branching pattern under swollen and tender skin. While relatively easy to treat via exposure to vinegar or strong wine, the infection is under the skin, which means the treatment is almost as unpleasant as the infection itself.

Death of the fungal infection will leave behind pronounce scars, but these will eventually fade in color from dark red or brown to pale pink or even white. Folk with these scars are considered unpredictable or untrustworthy, and may be encouraged to move on quickly in certain, particularly suspicious towns.