How to enter in lv 80 instances

Hello, I'd like to know what's needed to enter in those instances:

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Everytime I try it returns this error to me:

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Thanks!

For these 2 instances you need reputation .
To increase your reputation you can buy an item.

ljitu wrote:For these 2 instances you need reputation .
To increase your reputation you can buy an item.

Which item is it? Or where can I buy it? :nappa: