An expedition into the unknown Heretic's End holds a secret to be discovered.
X4: Foundations - Kingdom End DLC Steam Altergift Discover the unique Boron ships, and fly them through distinctive systems, on a journey of discovery. Enjoy a long-awaited reunion with the Boron in X4: Kingdom End, the fourth expansion for X4: Foundations, which completes the collection of the main factions in the X Universe.. Visit fascinating places, uncover old secrets and make new acquaintances.