Actually the game does store most information on the client as well. I used cheat engine during epic 3-4 before they used GameGuard to find Player HP,MaxHP MP,MaxMP, Lvl Pet HP,MaxHP, Mp, MaxMP Camera X,Y,Z angles, Mob HP,MaxHP MP maxmp, Even was able to get the MaxHP and LVL of other selected players.
But since they are now using gameguard untill a bypass of the hooked functions taht cheat engine uses to read the processes memory there is no way of getting these addresses.
But as Night said, its not really reliable as the base addresses change from time to time depending on how each weekly patch effects the game. And new epics change them completly