Although I'm no lore expert but I know that siva was meant for colonization tool but was turned into a weapon in some aspects which led us to splicers and siva lords So my idea is later down destiny's future is as our guardian travels to old colonized planets outside our system we discover that it was destroyed by an unknown origin and later after exploring we discover all of the planets inhabitants are turn into siva like zombies This was pre-collapse incident where siva was introduced and it turned hostile and completely destroyed the minds of all and since they have no other motive (purpose) they result into the siva we know and basically tries to turns everything into siva And covered up by the government of the golden age so it's unknown by anyone I think would be really cool concept like your ship crashed from siva pulling you from the sky and you have to survive and find your way off this siva infested planet Along with this would be siva structures/towers where you have to climb and fight certain and unique enemies for special rare loot This could also pan out to destiny events when colony ships infested with siva hit like earth you and teams of guardians have to defend earth from this plague Basically feral monsters infested by siva is what I'm going for and I want this to be like a horror survival portion of the game giving the player to be repulsed by what's happens to these inhabitants [spoiler]think of them kind of like the flood[/spoiler] Feel free to add ideas Edit: hopefully this would be rated M that way if bungie made them it could be very vivid in the idea of siva reconstruction of human flesh