Ple-Sen
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I was thinking more along the lines of something like a sedative, actually. The main concerns are that they are either cannibals or worship the guardians of the ruins. But the latter hasn't been substantiated yet. It's quite possible that they are simply runaway slaves/their descendants, hardened by the harsh life in the wastelands. That's why they distrust everyone around them, as they are surrounded by slave traders, monsters, and demons.
Added 2 minutes later
The presence of ogres among them, by the way, fits the idea of runaway slaves.
Added 2 minutes later
The presence of ogres among them, by the way, fits the idea of runaway slaves.