Epic+Simile12

Epic Simile: Her legs- and there are twelve-are like great tentacles, unjointed, and upon her serpent necks are borne six heads like nightmares of ferocity, with triple serried rows of fangs and deep gullets of black death.

This is an epic simile because it is comparing Skylla, a terrible creature, to nightmares, pain, ferocity, and death that snakes, heads and tentacles all bring along. Skylla, with long, sticky legs, which are connected to a snake-like body, has six heads, all of them which can only be used to cause destruction and are filled with anger and her long rows of fangs which can only bring death to whatever it grips upon.