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With the investigation check, you don't find anything of interest on the corpses of the kobolds, except for each having a shattered glass vial that once contained a strange liquid that is now spilled and scatted on the ground. The wood containers in this room, like the ones you moved earlier, appear to be empty or containing some hay. For the 4 small pile of bones on the table, your captors were probably just eating the bones of some small prey animal. But a question is raised that, if there was 4th pile that someone ate from, where was this 4th person and what are they doing?