Nuking?

Ok....I see a lot of people saying things about nuking. What is it exactly? Is it just where you attack someone over and over again?

Also....is there a max level in this game and how do you sell/trade ash?

Nuking is just a term referring to when someone is attacking someone else at a fast rate trying to take lots of kingdoms.

There is a max level, it increases by 10 each month, currently 1990 I believe.

To sell/trade ash you have to do it before it's destroyed, you sell/trade the items that become ash, then the buyers of it do the destroying.