During the Credits
There are no extras during the credits of Darksiders II.
After the Credits
There is a very short extra scene after the credits, check out more details and spoilers below.
The extra scene shows Lilith talking to a character who isn’t shown on screen (likely Lucifer) who she refers to as “my Prince.” The mysterious voice asks Lilith where are his army of nephilim that she promised him. The scene ends with the voice saying that this time Lilith will get no pleasure out of her punishment for failing him as she screams while the scene fades to black.