Where/what is the Deep?
Is the Fundament a physical planet/location?
Who are the Helium Drinkers?
Who are the the Ecumene?
Did the three sisters ever kill Taox?
Are Savathûn and Xivu Arath still alive?
Did the Traveler cause the God-Wave?
Edit: Do you think the Krill were inherently evil, or do you think they were they tricked by the worm gods who were imprisoned by the leviathan in the core of the Fundament?
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Fundament is indeed a physical place, those who inhabit it and it's moons are known as helium drinkers. I think one sister may be dead due to oryx wanting power to slay Akka. However she may still live in the amendment realm.