Yammas was a variant glyph of warding that caused many screaming, bloodsucking lamprey-like mouths to emerge from the surface and attack good trespassers. Only usable by evil clerics, it was detailed only in the evil spellbook known as The Nathlum.#dndhttps://forgottenrealms.fandom.com/wiki/Yammas https://dice.camp/@FRWiki/115548409581082009
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