Introduction
Commoner's are technically the most common type of bloodline in the game's world by a vast majority. However, player characters are free to pick any bloodline, including that of the commoner. Why they have no special bonuses, there is something to be said for the mundane and how they interract with the world.
History
Commoner's have no specific history for their creation. They have simply always been, surviving in a world where not everyone is the same as they are. Commoner's are any non-magick being from any land. As such, their histories vary. Please review the histories for Vilkas and Daviskas for more information.
Playing a Commoner
Commoner's are, in fact, common. They don't have any special abilities, and simply live in the world as normal people. While this is true for most of the Non-Player Characters, for the actual player controlled character's this isn't necessarily the case. PC character's are well above the norm. They are far more skilled than your average NPC, and have the ability to balance out the benefits of dealing with magick creatures by having numbers and tools.