As per Shastra’s :

।। दुर्गवातधिष्ठात्री नवरूपा महेश्वरी तं धरस्येव्दामहस्ते रुद्राक्षं भक्ति तत्परः सर्वेश्वरो भवेन्नूनं मम तुल्यो न संशयः ।।
शिव पुराण, अ. २५, श्लो. ७४/७५

9 Mukhi Rudraksha is controlled by Nava Durga. By wearing it on the wrist of the left hand, the person becomes like Lord Shiva.

Shiva Purana, Chapter.25, Shloka. 74/7

Essence of Nine Mukhi Rudraksha:

The 9 Mukhi Rudraksha is blessed by Goddess Durga in all her nine magnificent forms. These nine forms are known as Nav Durga. The quintessence of Nav Durga worship is sheer dynamism with raw power. Goddess Durga is addressed as Shakti and she is the primordial energy of the entire universe.

The energy of this divine mother is encased in the 9 Mukhi Rudraksha. This divine bead is worn for the grace of the Devi as a protective armour is formed, shielding the wearer from all evil forces. The Nav Durga manifest to readily spring on evil hostile forces so that the wearer experiences a surge of strength and energy. They are Shailputri, Bramhacharini, Chandraghanta, Kushmanda, Skandmata, Katyayani, Kaalraatri, Mahagauri and Siddhidhatri. They are worshipped during Navratri. As per Padma Puran and Shrimad Devi Bhagwatam, Lord Bhairav also blesses this Rudraksha.