Shiva Purana 3.8.2 states:
Bhairava is the prior form of Siva, the great soul. Fools who are deluded by Śiva’s Māyā do not know about it.
Bhairavaḥ pūrṇarūpo hi śaṃkarasya parātmanaḥ | mūḍhāstaṃ vai ...
The following is a list from the Shrikanthi Samhita of the 64 Bhairava Tantras and their 8 classifications:
Yamalasataka - BrahmayAmala, VishnuyAmala, Rudra-yAmala, Swacanda
yAmala, AtharvanayAmala, ...
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