So let's say you made 2 humans and one awoken but you really want to change one of your human characters to an Exo but you don't want to delete that character.
What do you do?
You can add a feature where you talk to The Speaker and hand over some strange coins, Motes of Light, Glimmer, or a combination of the 3 in order to change ones appearance.
A feature like this would be useful to those who would like to change their characters, especially if those characters have had a lot of time put into them.
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This is something that Bungie talked about doing but haven't put work into it yet. I can't remember the source but I think it was a pod cast with game informer or something like that.