Vyaghata is the 13th Nitya (Naisargika) Yoga, which is ruled by Vayu and and considered to be malefic one (especially first 9 Ghatis of it). It is one of 7 other malefic Yogas of the lowest order (comparing to Vyatipāta and Vaidhriti, which are malefic Nitya Yogas of the highest order). Its effect can be described as "killing" or "slaughter". Shukra is a Graha, who rules Vyaghata.