After careful examination of the arcane runes, Ara realizes that the are a form of abjuration magic. Ara hypothesizes that Abjuration magic on the outside of container, is meant to keep some extra-planer being trapped inside. Given the piping, it possible that this was some type of heating device and if so, would contain an elemental.
Turning to the party, Ara states "What I know, the runes are some type of Abjuration Magic - meant to banish or contain extra-planer entities." Ara continues "As to what I suspect, I think that some elemental was or is trapped inside the device to provide either heating or cooling through the pipes."
"This leads us to a decision point." Ara continues, "The keg is like any door in this citadel, possibly containing a monster and or treasure. The difference is that whatever is in there will remain trapped until someone releases it and so unlike the Goblins poses no risk to those who do not tamper with it. The party faces a decision - open the container or leave it unopened. Those who came for treasure will likely want to see what is inside, despite the risk. Those who came for other reasons, will likely want to leave the container alone. Personally, I would like to leave the container here, and come back at a later date when I have a little more magic. However, I will support the party in whatever it decides."
