Just imagine it. Your looking for someone to do Trials, or the Raid, so you use an emote where your guardian just pulls out a sign that says LFG on it until you tell them to stop.
Now that's an emote I'd waste my money on.
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Maybe as a community we can pick a dance and let's just say the happy (Carlton) dance and if u see someone doing that their probably looking for a group sort of like waving heavy in trials