https://www.gamespot.com/articles/final-fantasy-15-ignis-dlc-out-now-on-ps4-and-xbox/1100-6455629/

The latest Final Fantasy XV DLC is out now on PS4 and Xbox One. Called Episode Ignis, it follows the story of Ignis as he attempts to protect Noctis. It includes a new companion, the opportunity to fight Noctis, and new music, as well.

The core of Episode Ignis tasks players with taking control of Ignis as he tries to fight through Altissia to locate Noctis. It takes place at the same time as Chapter 9 in the main game, so it's probably worth finishing the base game first before tackling the DLC. Episode Ignis has a branching storyline with several endings, so your choices along the way will affect how the story plays out.