https://www.pcgamer.com/bungie-discusses-the-creation-of-last-wish-and-destiny-2s-colossal-raid-boss/

Bungie has peeled back the curtain on the creation of Destiny 2: Forsaken's raid, Last Wish. Over on our sister site GamesRadar+ Tim quizzed raid team lead Joe Blackburn about the raid's inception and the design of the awesomely huge final boss. 

"Riven was more of a response from when we made Oryx," Blackburn says. "Players felt like they didn’t have much interaction with this giant creature. So we were like “OK, we need to put the players really close and then we need to have the monster interact and not feel like it’s sort of a puppet on a train ride." We tried to do as much as possible to make Riven feel alive and massive but also having her own will."