This is a consecrated linga of Surya Deva. This linga is on the right hand side of the entrance to the temple. It is said after installing the main linga, he took this form.
There is a place to sit and meditate. You can go into meditative states here effortlessly.
How to get there:
The temple is located 850 m North of Draksharamam Bus Stand.
Map: https://maps.app.goo.gl/YuBfaQVpEPMabh5YA