Preparing for Tomb of Annihilation requires studying the villains. Ras Nsi is a fallen paladin turned Yuan-ti malison, a tragic figure. The Tomb of Annihilation PDF explains his complex relationship with Acererak. He is suffering from the Death Curse himself, which provides a diplomatic angle for the players. A DM who reads the digital background lore can portray Ras Nsi not just as a monster, but as a desperate leader. This nuance is found in the deep text of the module. The PDF allows for quick fact-checking during the tense negotiation scenes in the Fane.