Vat creature

Large liquid-filled vats containing strange psionic creatures were secretly placed into the room. The creatures were conscious, but could only be glimpsed swimming in the dark liquid which gave off chemical smoke. Their psionic emanations terrified the Protoss and psychic Terran who encountered them. Their true nature remains unknown.

Refugee warrior Ladranix believed the vats were not created using Protoss or Xel'Naga technology.