In Shaiva Tantra, Lord Shiva holds immense significance as the ultimate deity and the source of all creation. He is revered as the supreme consciousness and the embodiment of pure consciousness, known as Shiva Tattva. The word 'Shiva' itself means auspiciousness, and Lord Shiva is considered to be the ultimate source of auspiciousness.

Shaiva Tantra is a non-dual practice, which means that it focuses on the unity of the individual self with the universal consciousness. Lord Shiva is seen as the ultimate guru or teacher who guides the practitioner towards this state of non-duality. He is believed to be the one who reveals the true nature of reality and leads the practitioner towards liberation from the cycle of birth and death.

Lord Shiva is also known as the destroyer or the transformer in Hindu mythology. In Shaiva Tantra, this aspect of Lord Shiva is seen as a representation of the dissolution of the ego and the false sense of self. The ultimate goal of Shaiva Tantra is to merge the individual self with the universal consciousness, and Lord Shiva is seen as the one who can help achieve this state by destroying the barriers of the ego.

Another significant aspect of Lord Shiva in Shaiva Tantra is his association with the divine feminine energy, known as Shakti. Lord Shiva is often depicted as half-male and half-female, representing the union of the masculine and feminine energies. This union is seen as the ultimate state of balance and harmony, which is essential for spiritual growth and enlightenment.

Lord Shiva is also associated with the practice of yoga and meditation in Shaiva Tantra. He is often depicted in a meditative posture, representing the state of deep concentration and inner peace. Lord Shiva is seen as the embodiment of the yogic principles, and his teachings and practices are considered crucial for spiritual progress.

In conclusion, Lord Shiva holds immense significance in Shaiva Tantra as the ultimate deity, guru, and source of all creation. His representation as the supreme consciousness, destroyer of the ego, and embodiment of balance and harmony makes him an essential figure in this spiritual practice. Through devotion and following his teachings, practitioners of Shaiva Tantra seek to merge with Lord Shiva and attain ultimate liberation.