Generally the best source of info is from the person that you got the clones from. I personally have never heard of killer bud referred to as Thor's Hammer, so don't expect that it is a genetic term for killer bud, as I spend a whole lot of hours every week reading about this growing stuff. There are soooooooooooooo many "strains" out there (I think of most of them as simple crosses and am not sure when a cross becomes its own strain) that keeping track of them is really quite impossible.