We got a quick peek at the finishing move system that’s on its way to Destiny 2 in the Bungie ViDoc about the Shadowkeep expansion coming in September. Now, Bungie has explained a bit more about how this system is going to work. It turns out it’s customizable, with one part style and one function. Bungie says it thinks of them as ‘combat emotes.’

In an interview with Polygon, Destiny general manager Mark Noseworthy and director Luke Smith said finishing moves are equippable flourishes that you can use to dramatically finish off an enemy once its health has dropped to a certain level – a bit like the glory kills from Doom 2016.

These coup de grace moves have several looks for each class, with Hunters, Titans, and Warlocks all having specific finishers. These, Polygon suggests, will likely be either earned through the game, or purchased through the Eververse, more or less the way emotes work now.
Indeed, Noseworthy even went so far as to say the team “thought of it as combat emotes,” and they look exciting in the trailer.

Original source: https://www.pcgamesn.com/destiny-2/finishing-moves-explained