I'm not sure if you guys already know, or if there's alreay a post about this, but the bersekers as we know them- blood thirsty warriors who charge halk naked at the enemy lines- are just a myth. If you want proofs, jus tread the 4-book serie "Saxon Chronicles" (or something like that) from Bernard Cornwell. It is historically accurate, and right in the first book "The Last Kingdom" (I'm translating so it might be slightly different) he states that those warriors never existed. Nevertheless, they would be an interesting, tough ahistorical, unit to have in the game. I'm not saying you should remove them, but that they never existed.