Immortals Meluha

If you're looking for a summary or thinking about starting the series:

They consider themselves descendants of Lord Ram and are governed by strict laws. They believe in the power of the Somras —a potion that grants longevity and near-immortality, hence the title "Immortals of Meluha".

Here’s a comprehensive write-up on Immortals of Meluha , the first book in Amish Tripathi’s acclaimed Shiva Trilogy .