The Mighty Thor uses the godblast vs. The Celestial Exitar the Exterminator (Part 2)
From: The Mighty Thor v.1 #388 (1988)
The exact purpose of the Celestials’ genetic manipulation is unknown.Repetedly returning to each world, the races in question are evaluated over a 50 Earth-year period and finally Should an experimented race “fail” by the Celestials’ standards, Arishem the Judge arrived on the target world to herald the coming of Exitar the Exterminator, a Celestial ten times his height that “purifies” the offending world and race by destroying its non-life-affirming elements. Thor was on the planet Pangoria when this happened, and was told the issues at stake were “too great for even an immortal to grasp”.