The base game is still required, though.
In Dying Light: The Following, you travel to a hazardous outback ruled by fanatical cultists whose beliefs have unnerving connections with the zombie outbreak. In order to succeed in this harsh countryside, you will gain access to fully customizable and upgradable dirt buggies. With a unique Driver skill tree, you will traverse the vast expanse of the Harran countryside in what will be your deadliest weapon yet.
Dying Light: The Following will transform your Dying Light experience through new game mechanics, environments and challenges on top of the established core of what made the game a break away success for millions of players around the globe.
See also: Dying Light: Enhanced Edition