You unlock this after beating the main story. The fight is pretty awesome and adds an entirely new ending to the story. I personally thought Episode Ignis was the best dlc out of the three. I might upload the optional fight against Noctis but don't expect me to no damage it because he basically doesn't give opening for some stupid reason.
![](https://s2.save4k.ru/pic/kCc3w3FPkAg/mqdefault.jpg)