To level buildings you ' re forced to play PVP and you ' re forced to do it good cause to grind Glory Points in this game is ridiculous hard . what ? you dont need to be good and its not hard . set a low def and just make sure your stay on fighter level for 4 gp each win . on fighter 1 you can clear your 10 wings in 10 min an go back to farm runes or whatever . i agree with the others , making gp bount to energy would make it harder to get them . it would also make arena completly irrelevant for most of the players . take me as an example . i ' m just fighter 3 , so still early game . why would i bother doing arena form monday to friday ? people like me would make sure to play arena on the weekend to get their crystals and thats it . but this would fk the arena system , because not everybody can get to higher ranks at once