TW: drvgs, implied violence, non-consensual (is that how you spell that?) drugging, body horror
Horror AU desert steves have dr*gs are are powders that will stay airborne for a while. They're very brightly colored so you can tell that it's there and what it is, but those still exist.
H!Desert Apprentice has dragged H!Colle to areas so he could give him some of these before, he claims that it was to "help his friend calm down". This unlocked the fear of going anywhere alone with someone else, ESPECIALLY if it's an enclosed area with no one else there, for Colle.
Sometimes, these dr*gs will be lined with potion effects, which is also bad because the potions in the horror au will modify the user's body. For example, the water breathing potions tear gills into the drinker's throat, morph their lungs, and grow webbing on their hands and feet. Some will grow patches of scales depending on the length of the potion effect. The user will feel these effects taking place, and it's very, very painful for them. The effects don't last forever and they eventually revert back to normal, which is also painful, especially since they don't have painkllers in this world... Yeowch.