The arena runs on a Q like a spread sheet that is set everyone gets basically the same sheets just at different times to make it equal to all players.. But you must be their to claim rewards unless you have auto take.. When I began I did not get a lot of gems never had auto take when I did get auto take leaving my pc idle all day and night usually pick up 100-200 a week without being their. The most I received in 1 night was 600 not counting the 1000 one I recived 1 day, surprisingly no one stole them lol* .. If you plan on going far on this game you must have auto take and idle the pc all day and night.. the last quests are hard to pass you end up with a serious sword and not able to get items to craft it.. but if you idle from day 1 if your lucky they will fall from arena chests, thus giving you the items for the sword or spirit..

Hope this helps Thanks for playing here on tynon.
Valkarie