Charyatantra
Charyatantra (performance tantra), is the second of the outer tantras, and although it maintains a strong emphasis on external ritual actions, like Kriyatantra, the emphasis is now upon obtaining liberation through meditation. It is therefore externally similar to kriya tantra, and internally similar to Yogatantra. The empowerments required are similar to that of kriyatantra, except there is a 4-fold vase empowerment.
There a very few scriptures that belong to this class of tantra, but the principal ones are the mahavairocanaabhisambodhi tantra, Subsequent tantra, and Vajrapani empowerment tantra.
In this tantra, Vairochana emerges as the principal deity, with all the other buddhas and bodhisattvas being seen as emanating from him. The Charya tantras are extremely influential in Japan, for example in Shingon buddhism.
Read more about this topic: Outer Tantras