The end boss for the Red Legion. This guy was kinda underwhelming. His music, nice. Background, nice. But I felt the fight itself was lacking. Still, in a weird way I wouldn't mind seeing him again. Not as a Nightmare, but something else. He became a being of pure Light at the end, it'd be interesting to see that again... unlikely it may be.

This post also includes other versions of Ghaul, from boss to helmeted. What? He didn't have a helmet in the campaign! That's true, but concept art as well as the first trailer for Destiny 2 show him WITH one. Using the concept art, I reconstructed it for both cutscene and final boss versions.

Default (normal, boss)
Helmet (normal, boss)