Acalanatha is the most powerful member of the Beast Fang Trio, who wears the bat-shaped Shakti. Endowed with the ability to copy the battle techniques of his opponent. He engages the Hachibushu after the defeats of Kundalini and Trailoh, subduing them effortlessly, and taking Saras' life. Acalanatha's superiority over his opponents was overwhelming, until Ryōma was able to discover his weakness, thanks to the memories of the Ryū-ō Shakti from the battle with Acalanatha millennia ago. Acalanatha was killed by Ryōma at the cost of his own life. Later, Acalanatha resurfaces even more powerful, revived by Shiva, and wreaks havoc among the ranks of Vishnu's servants. Despite seemingly unbeatable, Acalanātha suffers a crushing defeat and finally dies at the hands of Shurato wearing the mighty Shakti of Brahma.

(Source: Wikipedia)