50 rainbow star chest

Only one per event.  Many people like to bank 50 stars during an event so they can open the 50 star chest right away when the next event starts.  A benefit to this is that if you suck at or just hate the next event, you can pretty much give it a pass.

You can only open the 50 star chest once per mystery portal event and you have a 75% chance of getting a trial key from it.

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@DragoEAflare562 wrote:

You can only open the 50 star chest once per mystery portal event and you have a 75% chance of getting a trial key from it.

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Drop rate has been increased to 100%.

Buffed to 100%? That's good to hear. Glad people won't get robbed out of a key anymore. 

But yeah, all three chests can only be opened once per event. I usually crack open all three anyway, even if I crack open the red one first. Usually at least something in those three that's worth the effort.