You can't. Corruption/Domination max out at 99 in post-game (like at the beginning of the game), so you can't get those bad ends in post-game. If you want to see the Corruption end, your options are to either unlock the full gallery with the item purchasable from Memoria in the post-game and view it there, or start a New Game +.how to increase her corruption to 100 on post game?