Scylla

Second Better Atempt, Scylla waits under the jagged rocks for any sailor who come to close, Maybe if I want to combined myths I could have the sirens on the island thats near Scylla

Scylla-Human-snake-wolf hybrid with a snake's tail, twelve wolf legs, and six long-necked wolf heads, or something like wolfs head's ravenous and evil... There are a lot of odd depicts of her, but the legend is Circe wanted revenge, because she loved the man who was searching for her, so Circe but a Poison in Scylla bathwater, and in the morning when she went to bath she transformed into a hideous ravenous beast...(