DeletedUser
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From the Tournament rebalancing (Feb 27, 2017) notes:
When is this going to be implemented ?On top of that, we are also adding some new rewards to these chests, such as broken shards that you can use for your Ancient Wonders. Do note: the maximum amount of broken shards you can store will remain at 10, so you will have to take care of making space to receive your rewards in time. With one of our future updates, we will make it possible to receive more than your maximum amount of broken shards - given that they come from the Tournament rewards.