Big event mystery boxes are reward items available from the Agents of Fury seasonal event. They are earned by giving Miithrius and Zymthara specific amounts of Zamorakian emblems for progress in the event, or by directly converting the emblems at a rate of 500 emblems per one big event mystery box. They contain a variety of Treasure Hunter items and some event-specific items which may be claimed if the mystery box is opened throughout the duration of the event.
When opened, big event mystery boxes yield a total assortment of four or five rewards, and the box is destroyed. Five open inventory spaces are required to open a box.
Ironman players will receive a message when reaching the 2,000 and 4,000 emblem marks as follows: Ironmen can't receive mystery boxes from this event.
The following is a selection of prizes which players can receive from one:
Additionally, players may receive some standard Treasure Hunter promotion rewards (in place of those listed above). Receiving a drop from this table replaces a drop from the previous table, but still counts toward the total of four or five given to the player per big event mystery box.