X-Risks details the dangers facing transhumanity:
- Over 60 creature and machine descriptions, classified by challenge level.
- Information on extinction threats, from AIs and aliens to nanoplagues and wormholes.
- Coverage of the TITANs, exhumans, exsurgent virus, Factors, and other hostiles.
- New exsurgent virus strains, psi sleights, and xenofungi.
- Traps for high-tech dungeon crawls.