Kim Dokja's feed

Why won't they explain the game mechanics of elixia?
What qualifies someone to be chosen as the king?

What did sehyun do other than give words of encouragement to bring his current Empire to the top? He doesn't look like he has powers or can stand up to anyone.

How did the grand duke kill sehyun 3 times already and he's still the king but the previous kings were killed and a new king came about?

I have so many more questions about this plot