Sea Hag

Hags are universally hideous beings, but even by the unbelievably low standards applied to their race, sea hags are abysmally grotesque. Despite their penchant for devouring their victims they have an emaciated appearance, although they can be of varying height and big-boned as opposed to scraggly. Befitting their haggard nature, their flesh is also rife with warts and oozing cankers.
Their complexion is like that of a rotting fish: pallid yellow skin with patches of green, slimy scales and bony protrusions. Their piscine eyes are similarly devoid of life with deep, black pupils surrounded by red.
The weak-hearted are known to die upon gazing at sea hags, but fortunately they have long, limp, hair that resembled rancid seaweed, which often conceales their true forms. Even without their squalid manes, sea hags can use illusory magic to disguise their appearance, although whatever form they take, they are cursed (or perhaps in their opinion, blessed) to appear ugly.