They all will mentally break you, but there is one that can destroy you if you allow them. — The covert/vulnerable/fragile Narcissist, hands down. These individuals’ “elation” and “deflation” stages make them the most dangerous. When they are in the deflation stage, they appear like vulnerable, hurt, abused puppies. You will want to pick them up, take their pain away, hold them, nurture them, and love them.