This is the final ending from Afterbirth+, and can be obtained by beating Delirium in the Void.

Here is the battle with Delirium: [ Ссылка ]

To unlock the void, beat Hush with (I think) any character, though I did it with Apollyon. Then, to get to the void, kill Hush again on another playthrough (I've seen some people say it's also after beating Satan/Isaac or the Lamb/Blue Baby but I haven't tested that as of yet).

свернуть