Nightkin (Fallout)

Nightkin are characters

Background
Nightkin can be found guarding the upper levels of the Cathedral, as well as inside the Mariposa Military Base, and in random patrol encounters in the cells around the base. Many of the Nightkin are equipped with cloaking devices, such as Stealth Boys. The only gaming effect of this is to give them a slightly ethereal look, as it does not affect the player character's chance of hitting them. After the Master's fall, many surviving Unity Nightkin scattered to other parts of the wasteland.

Appearances
Nightkin appear

Bugs
Some Nightkin that fight unarmed disappear (become "invisible") during the player's turn in combat and can not be targeted. The only way to end a battle with them is to either flee the area or have them be killed by an accidental fire, e.g. by other enemies that miss and hit them or using a burst mode of a weapon targeting any other available target with the intent to hit the supposed "invisible" Nightkin.