Defeat Moonbeam and a Dart.

"I think Jess actually manages to get one over on Sabine and has her pinned. Next in the order is Magnus, make a dexterity saving throw for me." "A dart flies by your neck, just missing you by an inch and sticks into the ring,. And you see it, stick into the ring, and then it vanishes in a puff of black smoke". 'It didn't come from anybody in the crowd or in the ring'