There was an Update a few days ago on OSRS called Larran's key, is a key obtained from killing monsters while on a slayer assignment given by Krystilia.
It is used to open Larran's small and Big chests. While untradeable, if it is not protected on death in a PvP scenario, the killer will be able to receive the key upon killing their opponent. If the killer is an Ironman, the key will be automatically destroyed.
Think this would be a great update for wild, more way's to get skilling items and will make the wild more active!
If you want to see a list of what you can get from these chest, check out the link below
https://oldschool.runescape.wiki/w/Larran%27s_big_chest