There is a thick band of bronze buried in the earth that the creek has uncovered. It’s covered in silt, but a stray glint must have caught your eye. It’s a band of what appears to be bronze, buried about 1m under the surface of the earth.
Radiates as magical, but not with detect magic
DC 20 (covered)/15 (exposed) to notice a minute vibration coming from it. .
Breaking the Band: This would be extremely bad. This magic is containing the last of the
The creature of many mouths and eyes is a Sibriex (demon)
http://thecampaign20xx.blogspot.com/2017/05/dungeons-dragons-guide-to-juiblex-demon.html
= borrow the twin of Coilen Esp, Lashen Esp
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You clear a small area to reveal what appears to be a pristine band of bronze, 4 inches high, 1 inch thick. Given what you have uncovered, it probably encircles the entire hill. It has sigils and glyphs graven upon it.
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Dunlapian with repeated vague warnings of evil from the abyss, incantations of containment, and references to the “Vale’s Memory”.