5e SRD:Invisible Stalker
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Medium elemental, neutral
Skills Perception +8, Stealth +10
Invisibility. The stalker is invisible.
Faultless Tracker. The stalker is given a quarry by its summoner. The stalker knows the direction and distance to its quarry as long as the two of them are on the same plane of existence. The stalker also knows the location of its summoner
Multiattack. The stalker makes two slam attacks.
Slam. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) bludgeoning damage.
An invisible stalker is an air elemental that has been summoned from its native plane and transformed by powerful magic. Its sole purpose is to hunt down creatures and retrieve objects for its summoner. When it is defeated or the magic that binds it expires, an invisible stalker vanishes in a gust of wind.
Directed Hunter. When an invisible stalker is created, it stays at its summoner's side until it is given a task to perform. If an assignment doesn't involve hunting down and slaying a specific creature or recovering an object, the magic that created the invisible stalker ends and the elemental is released. Otherwise, it completes the task, then returns to its summoner for more commands, forced to serve until the magic that binds it expires. If its summoner dies in the interim, the invisible stalker vanishes after completing its task.
Unseen Threat. Invisible stalkers are composed of air and are naturally invisible. A creature might hear and feel an invisible stalker in passing, but the elemental remains invisible even when it attacks. A spell that allows someone to see the invisible reveals only the invisible stalker's vague outline.
Elemental Nature. An invisible stalker requires no air, food, drink, or sleep.