The Realm of Eärwa
The Bleak is a festering magical maelstrom, and the source of arcane power. In many realms, the font from which arcane magic flows is ethereal and mysterious, but in Earwa, it is a physical force of nature that mars the land endlessly. Chaotic and volatile, it is an untamable, unforgiving maelstrom that transforms (or obliterates) everything it touches. The arcane energy that makes up the Bleak is believed to be the direct result of a laceration in Imminence itself, bleeding the Bleak onto the material plane from a great planar wound, eons old. The Bleak is more active and tangible in Earwa than most realms. Mostly prominent above the oceans of the realm, it commonly brings its unpredictable and destructive tempests to the landmasses of the realm in the form of Bleakstorms and Bleakrifts. One might argue that the Bleak originates from the evil gods, while Divine magic flows from the good gods.
As the Bleak is festering, the space between planes grows restless. Like any untreated wound, there are ghastly consequences of the Bleak endlessly seeping into the material plane. Darker, more eternal evils that slumber between the fabric of the realms are beginning to stir, and forces that have not been reckoned with for millennia are slowly turning their immortal gazes to this fissure into the material planes.