What you've done is played the game atrociously and killed almost all the Mudokons (congrats). What the Magog Cartel has done is made you bullet-proof so you can do it all over again. Nuts to them, of course, you're gonna save them all, right?
Actually, you can't become uninvincible once you've done that. I suppose you could try the cheat code for invincibility and see if that turns it off.
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