Summary pulled directly from Steam - Some text may only be applicable to Steam platform

Confront the repercussions of a failed uprising! In order to save the lives of dedicated rebels, Lara Croft must navigate the treacherous waters of a never-before-seen challenge tomb, infiltrate an enemy barracks to stage a prison break, and face cultists in their mountain stronghold. The Serpent's Heart offers new customization options, with the Dragon Scales outfit, the Serpent Lash bow, and the Divine Bounty skill, which rewards Lara with more gold pieces when looting fallen foes.

Included in the Croft Edition and Season Pass, also available separately.