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Overwatch’s latest limited-time event comes with a short story about Mercy that players can read online. The story is called Valkyrie, and it’s penned by Overwatch lead writer Michael Chu. The event pushes players to win nine matches to earn the new legendary Dr. Ziegler skin for the beloved healer. At three wins players earn a new icon, six wins gives them two new sprays, and the final three wins gets them the gold.

The event runs from today through December 2. If you watch matches on Twitch for two, four, or six hours, you’ll earn additional sprays.