Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Use a text editor to edit the "game.erg" file in the "data" folder in the game folder. Remove the hyphen "-" character from the line:

"-BO2 Kain Debug Flagskain's invulnerable"=1

so it now appears as:

"BO2 Kain Debug Flagskain's invulnerable"=1

-From: egorow.ru