Source: The Blind City, pg(s). 58
Pyric harbingers are the constituents of the gestalt elder entity known as the Eshtayiv. They wander the universe to find and illuminate dark places and kill creatures, instigating terror and transforming them into pyric revenants. A pyric harbinger resembles a maw-shaped gelatinous sphere covered in flames that measure 5 feet in diameter and weigh 100 pounds.