Sierra, the new terrane leader

There was once, in the world of Nika-Karaj, several empires that were represented by a certain element. ( telling you right away... I didn't copy avatar ! I didn't even know what it was until I told my story idea to my friends XD )

In this world, every 40 years, each empire is forced to get a new king or queen that will lead their nation.
The rules are;

1~ the new leader has to be between 16 and 20 years old
2~ our God is most likely to choose a male, unless for number 3...
3~ if the previous king or queen has a child between 16 and 20... He/she Is destined to become king or queen
4~ if king or queen... You will probably have the responsibility to marry another empire's leader or a family member of theirs
5~ the new king/queen HAS to be someone from the same element as the one before

The strongest empires are fire and water, with earth and air tied for second. There are about twenty empires that exist. Half of them are in the aqua alliance while the others, in the inferno one... Well actually the light and darkness empires have some alliance with others, but they are not in a official alliance. Anyways... Sadly, both sides have been in war for the last 37 years.

HOPE YOU ENJOY !!! THIS WILL BE MY FIRST BOOK !!! PLS COMMENT TO LET ME KNOW WHAT I CAN DO TO MAKE IT BETTER !!!