Shelob

Shelob, Guardian of the Ephel Duath.Immortal daughter of a demonic mother, Shelob occupied the caverns of Cirith Ungol for two full Ages, serving as a guard for Mordor. She owed no loyalty to Sauron, but rather operated on her own initiative in a way that served his needs ,much as the desires of a cat to kill vermin serve the needs of the man whose house she chooses to occupy. Indeed, Sauron often would send otherwise useless prisoners to Shelob as a man would give his cat the giblets of a hen he had slaughtered for his own table, yet "his cat he calls her, but she owns him not" (the Redbook of Westmarch, commenting on Shelob's relationship to Sauron). Indeed, Shelob had precious little use for Sauron beyond considering him a source of occasional treats.

Shelob's bulbous body is some 20 ft long. Each of her armor- plated legs is 18 ft long at full extension and ends in an iron-hard claw. She constantly exudes a foul odor like rotting carrion, forcing all who come near her to fight immobilizing nausea (a RR vs. a 5th level attack). Her body is surprisingly flexible, and her tough hide consists of many overlapping folds, enabling the giant she-spider to fit through amazingly small passages. This overlapping hide is as tough as plate armor, leaving her two clusters of glowing white eyes her only weak spots. Her legs, however, are somewhat more vulnerable than her body. Both her eyes and her legs will regenerate, given sufficient time, even if severely damaged.

Shelob is also mistress of many spells. Her one true vulnerability, other than her delicate eyes ,is that she cannot bear full sunlight or the equivalent.