I want to be able to hold up random things for the hearthlings around me to see. A symbolic item? The skull of a vanquished enemy? Some combat trophy from hunting in the wilds or in a dungeon? A rare curio? The possibilities are endless.
It would be fun.
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Your picture has also reminded me how people emote in Dota 2. They press a hotkey and a few emote/phrase options appear. We should have something like that in hafen, for quicker communication (or even write our own phrases = use in combat).