What if there was a faction of Eliksni that fought for the City? Here's my back story: At one point, a Dreg of the House of Kings named Saksi led 29 others to escape to the City. Saksi believed that the way to restore the former glory of the Eliksni was through an alliance with the humans. He thought that Eliksni and humans were not all that different. They came to the City unarmed. Upon entering the city, they were taken into custody and brought to the Vanguard. They set up a comm link with Variks for translation and the Dregs revealed their intentions. The Vanguard decided that if they lived in the City for 3 months as normal citizens, then they would speak again. 3 months later, diplomacy was attempted, and the House of Light was formed. The Traveler provided them with Ether, and the Eliksni would one day flourish in the company of humans.
Now, regarding gameplay, really all this might do is add another playable race.
EDIT: I've changed my mind about how they get Ether. Guardians must give Ether Seeds, much like a material donation to a faction. I tried tagging it "non canon".[armory][/armory]
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I had an idea like this but just adding on now. So first as you said there are only like the 20 house of light fallen but later they will multiply (unless their all dudes) but what I'm saying is you could do patrol and get supplies for them and a reward of finishing a bunch would increase their numbers so later you could have your own ketch (which you would have to steel probably from the house of winter as a mission). Now when you finish the Champaign of this new DLC or Destiny 2 You have an upgrade system like your guardian with your ship and stuff. Upgrade spaces to hold more fallen, build a hanger to put your skiffs in, recruit a fallen Arcon and a pilot servitor, get walkers and pikes, etc. Just do patrol I guess to get the supplies, kill the traitors, find new tech to use on your ship. With all of this I was thinking of a mini game kind of thing with this, just like in Assassins creed Black flag with their fleet thing. . So it shows each planet and let's just say earth for right now. It has a map of earth with colors of other fallen houses and hive who controls each area. So you use your fallen to go down their and take area. I think it should take real time so it doesn't go fast. And the main thing is your trying to get this "House of Light" to conquer each planet. Of course there will be places you can't conquer so it doesn't ruin some thing already in the game. This was what I had in mind, as an add on to this your idea.