This is speculation but it holds true if you look at it with an open mind. Here's how one should look at attack. While this may not sit right with logic nuts it actually makes sense. Attack=lvl of enemy of which your weapon is effective. It's as simple as taking away the final digit in any givin attack value. The remaining number is then your effective lvl killer. Attack =250 250 minus the 0 = 25 thus being effective on 25's Same goes for any damage weapon.