Would it be possible to communicate with the Fallen and maybe form an alliance? The Fallen get their love of the Darkness from a philosophical look at it. A random Eliksni, Vandal I think, recorded why he worhshiped the Dark.
The Fallen were a great race that the Traveler once guarded. Now that Ether is scarce, they need to steal in order to remain powerful. The Fallen that thought the Darkness was so great, thought so because, "You can't steal from the Darkness." He respects what he cannot steal from.
Now, this is a pretty weak belief, anybody can understand. But if we offered the Fallen Light from the Traveler, I think that we could work well together.
If this became the plot for an expansion, it would be amazing! Guardians could now use certain Fallen weaponry, and maybe, if this was the plot for a new game, we could choose to become a Fallen Guardian. Think about it, becoming a Vandal.
Of course, this is a little far-fetched, but I think it would make for a great plot of a new expansion/sequel.
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Now that the splicers have gone out of control its seeming more likely every dlc