Not sure if it can be called a story as it is, but it does capture a certain moment in Kahru's life. You see, this draenei woman was born very fragile and weak due to her mother's disconnection from the Light, so she's had to use all kinds of medical concoctions and drugs to help her get going.

The breather in the picture is purposed for unusual situations like battle or scouting, actually. The liquid in reservoire (in the middle) gradually evaporates, creating a strong alchemical mix, which (when inhaled) enables a number of temporary effects, some very similar to buffs as we know them, some akin to adrenaline rush. That depends on the liquid of choice. And the crystals are just arcane stones that can be depleted if necessary. Though their main purpose is to keep breather systems working.