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