You put a huge smile on my face. I know it may seem kind of lame, but it does.
Does this happen to anyone else?
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In the raid that ends with the Nexus, there is a laboratory room with 2 levels and a few Vex in there. Sometimes (happened twice for me)... one of the Vex will wave at you. So if you can't get a Guardian to... a Vex will do the job. It's more of a 'Royal' wave... not a full arm extension.