Strange chest spawn

There is a chance that a strange chest will spawn at this location. This can occur at 1 minute past the hour, 16 minutes past the hour, 31 minutes past the hour, and 46 minutes past the hour. By attempting to open it you will gain thieving experience. After each attempt there is a cooldown timer of 20 seconds. If you manage to get the right combination you get one of the items listed below.

Regular item obtains

You always obtain one of the following items by doing this action (maximum amounts are shown):

Groupfighting

Groupfighting works differently from regular combat in the sense that multiple players can fight the same creature simultaneously. Each round every participant attempts to hit the creature, and the creature strikes at one of the players in the fight (or sometimes no-one). The experience is divided by all participants equally and the player who strikes the final blow gets the creature drop.