The Oedon Writhe is a sinister, intricately designed rune with a twisted, serpentine form that seems to writhe when viewed from different angles. Its surface is dark, almost black, with a subtle metallic sheen that catches the light in eerie ways, featuring deeply engraved symbols that pulse with a faint, otherworldly glow. The rune's edges are sharp and irregular, giving it a jagged, almost alive appearance, as if it's a fragment of some greater, malevolent entity.