Invisible stalker

Invisible stalkers were solitary creatures native to the Elemental Plane of Air.

Description
As their name implied, stalkers were invisible and their true form was largely unknown. They could only be perceived as a shimmering mass of air on the Material, Astral and Ethereal planes, similar to the refraction that's caused by hot air passing in front of cold.

Behavior
Invisible stalkers were known to deeply resent any task given to them, but were relentless in pursuing its completion. If the stated task took the stalker a week or more to complete, it would gradually pervert the stated intent of their assignment and look for loopholes. Because of this, commands had to be carefully worded.

Some held a deep distrust or outright hatred of humanoids, due to suffering at the hands of ones who summoned them or having been killed by humanoids.

Abilities
Stalkers had the innate ability to remain invisible even in combat. Stalkers attacked by using gusts of wind to pummel their opponent. Killing an invisible stalker anywhere other than its home plane dismissed the stalker back to its home.

Ecology
The life of invisible stalkers on their home elemental plane was largely unknown, with many assuming it was similar to that of the standard air elemental.

The presence of invisible stalkers on the material plane was typically due to being summoned by a mage or wizard to perform some task.

Appearances

 * Novels
 * Ironhelm
 * Video games
 * Baldur's Gate II: Shadows of Amn • Icewind Dale: Trials of the Luremaster • Icewind Dale II • Neverwinter Nights • Neverwinter Nights: Tyrants of the Moonsea
 * Board Games
 * Battle for Faerûn
 * Organized Play & Licensed Adventures
 * The Howling Void • Durlag's Tower