In Darksiders 3, you’ll get secret and normal endings. The alternate end reveals more story details. In order to unlock normal ending, all you have to do is to kill seven deadly sins (Pride, Avarice, Wrath, Sloth, Envy, Lust, Gluttony and Traitor) and a traitor.
Once you kill all the above opponents you see the final sequence that most of the players will probably experience. However, there is also a secret ending that further enlightens the events of the game and also presents the ending a little differently.
Unlock Secret Ending
In order to unlock the secret end, you must find Abraxis. You’ll find this demon in Scar. After defeating Wrath, you can easily get to Abraxis via a wind column and a lift.
In the first encounter with Abraxis you make a decision that will trigger the secret end. Kill the demon and grab his soul! Select "Kill Abraxis" in the conversation. The soul of the demon then takes you to the Prince of the Abyss in the area Chamber of the Prince of the Abyss.
Again, you initiate a new conversation and the second of the decisions in which you can spare or kill the prince. Choose the peaceful variant and deliver the soul of Abraxis. If you finish the game now, you will see an alternative ending sequence and you have triggered the secret end.