So picture in your mind your favorite exotic, is it the Nighthawk? Garrison? Tllaloc? I bet you all the money in my wallet that it isn't an exotic ghost that's for sure! The idea of an exotic ghost is thrilling to say the least, they could have so much potential! Imagine foundry specific ghosts (kahkisHD has a video about this that was pretty great), exotic ghosts for factions, or maybe even class specific ghosts. The RoI has so much potential for new wonderful mechanics weapons and exotics, so why not add in some fancy schmancy ghosts?
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So have a quest line similar to the sword quest lines. You can only choose one elemental damage. But I'd through one twist into it, you do the quest as a ghost. It would result in the ghost being able to assist the Guardian with one elemental damage type, good for us and it would be different and fun.