For a couple Motes of Light, this vendor will sell/tell you a story.
The story is told in the form of a really nice animated cut screen (say 3-5 minutes long each). They might retell the story of an Ikora Rey adventure.. or they may recount the arrival of the aliens and their annihilation of humans on colony planets... or ... whatever story you are trying to weave with destiny.
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This is actually a really cool idea. They could be tied to Grimoire cards you've unlocked. It would give motes of light another purpose and let those who want more story have it, without having too many cutscenes in the middle of missions.