Rising Tide doesn't have as many story revelations as its predecessors, but is still worth noting. Rising Tide involves getting the help of an Old War cephalon to build a railjack: an ancient warship used in the fight against the sentients. You make your way across the system, obtaining parts as you go. This goes as well as it can go until you need to obtain and fuse your power source. Neither you, nor the cephalon, nor anyone else for that matter knows what this power source is that can fuel this massive ship. What you do know, however, is that it whatever it is, it came from the void. This is never a good thing, as we know, and the quest ends with a suspicious cutscene showcasing the power source seemingly knocking on the glass aggressively. Perhaps trying to get out? perhaps trying to communicate? For now, it's unknown. That's how this quest ends for now