Turn in a thread where your characters have picked up any black mirror shards from the lake by 20 July. You don't need to have completed the entire thread by the submission time, just the collection.

You're welcome to do as you please with the shards, but they have historically had good traction as long-term plot elements, so why not... keep them? You can also pick between one clue or one reward, for having picked up a shard.