How to make endings?

[MFS]

Hi, I saw on youtube some mods with custom endings made by the fans, for example here we may see Bosses' endings, including even Shao Kahn - https://www.youtube.com/watch?v=iM4BsX0LG5M
Does anyone know what format are these animations & how to make them?

[Elias]

I also have the same question, but you only have to edit the texture of a file ui_e_"CharacterName" the Duke Nukem mod also has the ending of jax edited
https://youtu.be/VBBYA_fLcds

and NOFACE has the ending of Kabal edited
viewtopic.php?t=48066