Pratchett, who's also the daughter best-selling fantasy and children's fiction author Terry, said: "I grew up playing Tomb Raider, uncovering the world's secrets and unearthing its treasures; I have lived and died as Lara Croft, but nothing comes close to the challenge of re-writing her.
"Seldom do we get the opportunity to reimagine and reinvent a legend, so getting my narrative hands on Miss Croft was a once-in-a-life-time opportunity. It was going back to the genesis of videogame action heroines and exploring how to make such an iconic character meaningful and relatable for gamers today."
According to Darrell Gallagher, studio head at Tomb Raider dev Crystal Dynamics, Pratchett has been involved with the retelling of Lara's origin from an early stage.
"Rhianna has been working on the game with the narrative from its early inception," he said. "She has brought a unique perspective to the project and helped us explore the character origins of Lara Croft. There is no doubt that Rhianna has brought a depth and credibility to Lara, a heroine who will really connect with today's gamers."
Earlier this month, Californication and True Blood actress Camilla Luddington was revealed as the new face of Lara Croft.