A monstrosity of a goblin experiment gone wrong, these mindless beings are being used for something for a much worst purpose. And with every creation there is always a creator.
You disable a trap, lock, or other type of mechanism.
A goblin has been collecting opossums for some reason, it seems they have escaped and are running wild.
Either a group of monsters brought this chest or were attracted to the area because of it. However it happened, the monsters seem agitated protecting it or trying to open it. Who knows what riches lay within.