Nightstalker eggs are found on the corpses of night stalkers. When they are found, it is unusual to find more than one. They are used in the production of Mushroom Cloud, and in the quest Bleed Me Dry.
- 6 can be found in a night stalker egg clutch in the Walking Box Cavern.
- There are several clutches in the Z-9 Crotalus DNA preservation lab.
- Found randomly on night stalkers which are found copiously in Bloodborne cave.