Power Stone used by Celestials

The Power Stone was used by the Celestials, like Eson the Searcher, as a means of placing judgment upon worlds and their populaces, wiping out entire civilizations by touching its power on the planet's surface. However, the stone was just as dangerous to its handler as it was to the societies against which it was used, so it was encased in an Orb and abandoned in a Temple on the Planet of Morag. Over time the planet was covered in Ocean due to the change of climate, so the temple was accessible only once every 300 years, when the waters receded.