Mystery box

Mystery boxes can be obtained from the Quiz Master random event. Players can choose between 1,000 coins or the mystery box upon successfully completing the random event. The box contains a random selection of items.

Possible rewards

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It is also possible to receive nothing. This will give the player a message in their chatbox saying, "Inside the box you find absolutely nothing! What a shame."

Mod Ash tweet on the details of the Mithril scimitar: https://twitter.com/JagexAsh/status/1087099408594939904.