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During his match with his eldest brother, Illumi used his nen on killua his nen type is Manipulation and its exactly how it sounds his nen has the power to manipulate people especially killua (illumi would brain wash killua in many different ways) illumi convinced him to stop the nonsense of becoming a hunter before him and his dad tells him he can and having friends so killua remained in his shell until he could prove his brother right(cuz hes not thinking because of what hes brother was saying) and kill someone (because he said all he can get joy out of is killing) and by killing some he cant become a hunter until he retakes it

later in the series we find out that illumi put a needle in killuas head keeping him from thinking rationally in battle making him feel like hes weak and he has to run from his enemies because they are strong

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