he reward for taking part in the event is 3 shadow crystals and 1000 kyanite. There are also extra rewards for the top 3 scorers.
Top 1 - will receive : Soul Crystal x 20 and Skeleton Key x 3
Top 2 - will receive : Soul Crystal x 15 and Skeleton Key x 2
Top 3 - will receive - Soul Crystal x 10 and Skeleton Key x 1