Hades 2's new ending was "was created in response to player feedback" – not part of Supergiant's original plan for the roguelike

"We conceived of it as a game where listening to and responding to player feedback would be core to the development process" ...
Pocket Tactics

Win Hades and Hades 2 on Nintendo Switch and head into the Underworld

Enter our Hades giveaway to win a copy of Hades and Hades 2 on Nintendo Switch, and dive into the excellent roguelike.
GamesRadar+

Massive new Hades 2 update finally adds a brutal final boss and, more importantly, a new pet sidekick

Hades 2: The Warsong update has been revealed, and it adds a final boss to the last level even though the game's still in Early Access. The roguelike sequel first launched in Early Access last May, ...