Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Use a text editor to edit the "WillowGame.ini" file in the "\My Documents\My Games\Borderlands\WillowGame\Config" directory. Change the value of the "bDemiGodMode" line to "bDemiGodMode=true". Although you can still take damage, you will not go below 1 point of health.