Keys to Hell

As stated by the Lord of the Worm Eaten City:

The keys to Hell were small carved circular disks approximately 4-5 inches in diameter.

The keys were often made by wealthy Ounish families for particularly beloved/important departed and were keyed to a specific soul so they could be visited easily. It is unclear currently whether there were specific doors to use these keys in or if these keys could re-purpose any door to opening to hell.

It is possible to use the keys to allow other souls aside from keyed one out of hell, though the mechanism through which to do so is currently unclear.

There is currently speculation as to whether or not the key creation process involved death masks of the corpse of the soul in question.