What is up with the rumble boxes especially the silver and black rumble boxes.  As of the past 6 days I've opened about 20 (if not more)silver rumble boxes plus 1 black rumble box and, not once have I got an active skill for my level 7 heroes nor did I get a new hero. It'd be great if this issue was addressed and fixed by improving the rate of getting a hero or skill after opening a certain amount of rumble boxes per day like if you open 2 silver boxes one day, opening a third silver box on that same day gets you either a hero or an active skill.

Dear Arena Players, Testing for the current version has not been completed yet. Please be patient to wait for a little longer before being able to enter the game. We expect maintenance to conclude at: 2:00pm EDT April 27, but depending on the situation we may finish earlier or later. *Once maintenance is complete, we'll send 2 Rumble Boxes to everyone's inbox(available until May 4th, 23:59 EDT). __________________________________________________________________

Just to clarify there is actually a drop rate written in the rumble box info in the hall of fame tab The chances of getting heroes are based on rarity the power cores and t-coins are just much more common due to the percentage difference. You can see the percentages of my current account. As you can see I got all but fort being the last to obtain. As for all-stars they have a fixed chance that changes every season.