Arun is right this is for the mobile app. Originally I did actually just use the "WL" letters. However, one of the most important purposes of an icon is to convey an idea of what the app is all about to people who are not familiar with the game. Just putting "WL" doesn't add anything. A map of the world with attack lines at least gives an inkling of an idea that the game is about conquering the world.
At one point I did put the full word "WarLight" in the icon, but it's not strictly necessary since everyplace the icon appears, the word WarLight will be next to it. Some apps do it anyway, and this icon does have room for it, but I still kind of like it best without the word there. Especially when viewed on a device where it says the app name directly below the icon.
#6 stretches the map vertically just a tiny bit and makes the background pattern slightly more visible. What do you guys think?