For 10 points, name this member of the Trimurti known as the preserver who is contrasted with Brahma and Shiva.
One form of this deity slew a foe with a thousand arms using an axe, while another form of this deity with the aspect of a fish saved Manu and therefore all of humankind. A third form of this deity had the aspect of a tortoise and participated in the churning of the ocean, while a fourth form of this deity is the namesake of a story told by Valmiki. Those forms, known as this deity's (*) avatars, also include Krishna, who advises Arjuna in the Bhagavad Gita. For 10 points, name this member of the Trimurti known as the preserver who is contrasted with Brahma and Shiva.
One form of this deity slew a foe with a thousand arms using an axe, while another form of this deity with the aspect of a fish saved Manu and therefore all of humankind.
Vishnu