In Shaiva Tantra, Lord Shiva plays a central role as the ultimate deity and source of all creation. He is seen as the embodiment of pure consciousness and the ultimate reality, known as Shiva-tattva. This concept of Shiva-tattva is the foundation of Shaiva Tantra, as it emphasizes the non-dual nature of existence and the oneness of all beings with the divine.

As the supreme deity, Lord Shiva is revered and worshipped in various forms and aspects in Shaiva Tantra. He is often depicted as the cosmic dancer, Nataraja, symbolizing the continuous cycle of creation, preservation, and destruction. He is also depicted as Ardhanarishvara, the half-male, half-female form, representing the union of Shiva and his consort Shakti, the divine feminine energy.

In Shaiva Tantra, Lord Shiva is seen as the ultimate guru or teacher, guiding his devotees towards self-realization and liberation. He is believed to have revealed the secrets of Tantra to his consort, Parvati, and through her, to the world. This makes him not only the source of all creation but also the source of knowledge and wisdom.

Lord Shiva is also associated with the practice of yoga in Shaiva Tantra. He is often depicted in a meditative posture, representing the state of deep concentration and union with the divine. The goal of Shaiva Tantra is to attain this state of oneness with Shiva, known as Shiva Samadhi, through various spiritual practices and rituals.

Moreover, Lord Shiva is also seen as the destroyer of ignorance and ego, which are seen as obstacles on the path towards enlightenment. In Shaiva Tantra, the ultimate goal is to transcend the limited perception of the self and merge with the universal consciousness, which is embodied by Lord Shiva.

In conclusion, Lord Shiva holds a significant role in Shaiva Tantra as the ultimate deity, guru, and source of all creation and knowledge. His teachings and practices guide his devotees towards the realization of their true nature and the ultimate goal of oneness with the divine.