I'm always a hesitant in placing my ideas online like this since I'm always afraid someone will take them and make them their own [Not saying anyone here would do that, just paranoia].
Shards of a shattered Rune are scattered across the globe. Ordinary people gain magical abilities by possessing a single shard.
No one knows where the shards came from or how long they have been in the world, but they all want to make the shards whole again. The bigger the shard the stronger the magic is, and so there is a power struggle to claim the shards. Each shard will merge with another if the shard is possessed before it's master's heart st