Eight mukhi Rudraksha is a rare and is found in rare in numbers.
This Rudraksha is blessed by lord Ganesha, the younger son of lord Shiva and manas putra of Goddess Parvati
This Rudraksha removes the obstacles and brings success
This Rudraksha also pacifies the planet Rahu.As per Rudrakshajabalopnishad it is a form of eight mother goddess, eight Vasus and Ganga all three give their blessings to the wearer
 It removes the obstacles and improves intelligence and health. Its ruling planet is Rahu.Hence helpful in sublimating the malefic effects of Rahu. It's malefic effects are similar to that of Shani