Magical rifts have been randomly opening all throughout the world, after the final near-cataclysmic battle of the Great Wars. They have historically appeared more frequently in the area of the final battle, though can appear at any place in the world.
They have no standard look, some appear as whirlpools, others like shards of broken glass, flame dancing in the air, and a famous song has one appearing as an eye.
It is commonly known that items sometimes appear, some of them common(if odd), some rare or unknown. Many are dangerous, and more dangerous is the chance that some sort of creature will appear and destroy any who are present.
The frequency of rifts is unknown, though it seems to be slowly increasing.