Potion very rare
This potion appears appear to all senses as a Potion of Elemental Control (Air). However if you open the potion, the contents vanishes, and an invisible stalker is summoned from the bottle within 5 feet of you. You are aware that the invisible stalker has been summoned but it is entirely invisible to you. The invisible stalker gains the direction to kill you as its quarry and will attempt to accomplish this task at all costs. More information about the invisible stalker can be found on page 192 of the Monster Manual.