Nightmare

The Nightmare is a hostile Typhon encountered on Talos-1 during Prey (2017).

Overview
The Nightmare is the biggest, strongest and most dangerous of all the Typhon. As Morgan Yu unlocks more powers through neuromods, this action will attract Nightmare attention and the creature will try to hunt him down. It will start its hunt after Morgan goes to deep storage.*

* It can start hunting after spending enough Neuromod points.

Design
Nightmares look like a bulkier version of a Phantom. They posses six white spots that can merge into one, which serve as eyes and seem to float around instead of walking. Nightmare can also shapeshift to better suit doorways.

Strategy

 * Hide until the Nightmare's associated side quest time is exhausted.
 * Gloo can work for a duration currently thought to be under 10 seconds. Useful for scanning more than offence.
 * Chaining several recycler grenades seems to be the safest method for a kill.
 * Circle strafing with a shotgun (especially upgraded) can often result in a quick kill.
 * If lucky it will spawn in as you are getting on or off the elevator. At that point you are safe from its attacks and can wait out the hunt in the elevator. Then go to a different area for a brief time and head back and it will be gone.
 * Turrets are often not very effective, but in certain areas the Nightmare can be trapped within firing range yet unable to hit the turrets, resulting in a guaranteed (if slow) kill.

Trivia

 * Nightmare is reminiscent of the Nemesis monster from Resident Evil 3