I'm going to move [...] to an existential economy based on the accumulation of secrets and the tribute of failing-to-understand-me. I shall name this tribute of failing-to-understand IMBARU

An engine to generate imbaru, Savathûn's reinterpretation of her brother's logic.

So, imbaru's real. Neato. Guess Savathûn really did refinance her entire existence before taking out a second ontological mortgage and being reborn in the Light.

Something's not quite sitting right with me, though, particularly in how readily we've been provided her tools and territory this season. While it's certainly in Savathûn's best interests to provide us with the knowledge on how to pass through into the Pale Heart and stop the Witness (she, after all, likes being alive), she's also never been one to act altruistically, or really, in any fashion that doesn't also forward her own personal agendas.

Besides, remember the last time took her up on an open invitation? We got manipulated into giving her all her old memories back, and she nearly shanghai'd the Traveler. I doubt that the access we've been granted to her Athenaeum, Spire, and Altars has no strings attached; I think that, just like before, the horse blinders of need stop us from seeing them until they're tightening around us. Savathûn certainly seems to be keeping eyes on the proceedings in some capacity, given the piercing three-eyed gaze of a Hive we can see directed towards us from distant stars in the Athenaeum.

Anyway, let's get back on track. It seems Ikora's been meditating on imbaru, even as she's been monitoring the events currently unfolding in the Throne World:

Savathûn didn't construct her Spire for Light and logic alone. There is more to this than meets the eye. That's the crux of it.

What is imbaru? Asking the question yields an ounce of tribute by itself; failing to answer it yields more. It's impossible to engage with the concept without falling into the web of cunning devised by the Witch Queen, even after her death. [...] imbaru is tribute from the failure to understand. [...]

Her recent commentary above reaches back to a much older conversation she had with Arach Jalaal, which begins to bring us full-circle.

Here's what I believe we can know with confidence: [...]

• [Truth to Power] concerns (a) the importance of singularities in Savathûn's personal cosmology and/or (b) instructions on how to mantle Savathûn. [...]

The Truth to Power manuscripts are pluripotent. There are many ways to read them. [...] What is the governing logic of Truth to Power? Being nonsense? Being convoluted? Being misunderstood?

At the center, we find the clearest profession of love: "Thank you, sweet friend. You are a gift and a delight. You are more dear than my mother, for you have given birth to me a thousand times."

Superficially, this is a reference to the concept of imbaru. Savathûn's plan to predicate her existence upon the misunderstanding of others. We "give birth" to her by feeding her power.

I think the whole Truth to Power manuscript is an ova, a manual on how to behave like her, how to describe her through action and thought so completely that you become her and thus give birth to her.

It's done in the Books of Sorrow, to recall her from true death. It might be done again.

Now, Savathûn doesn't really need or benefit from tribute anymore. Her worm's long gone, and while it'd be fun to imagine this all tying into a Parasite catalyst, I don't think that's the direction things are going. Pay attention to the other half. Imbaru is a piece in the bomb of how to mantle the Witch Queen. Imbaru is Savathûn's reinterpretation of her brother's logic - and this is specific! Not the Sword Logic the Hive all live and die by, but a thesis Oryx alone had.

Ikora's note from before has a coda:

We might think we know what we're doing here, but in many ways, I doubt we do. There will be ripples from Eris's actions. We can't predict what waves she'll make.

I can see you in the sky. You are the waves, which are battles, and the battles are the waves. Come into this vessel I have prepared for you.

So I will prepare a book, which is a map to a weapon. And my vanquisher will read that book, seeking the weapon, and they will come to understand me, where I have been and where I was going. And then they will take up my weapon, and they will use it, they will use that weapon, which is all that I am.

And armed thus with my past, and my future, and my present (which is a weapon, a weapon that takes whatever is available, a weapon bound to malice), they will mantle me, Oryx, the Taken King.

They will become me and I will become them, each of us defeating the other, correcting the other, alloying ourselves into one omnipotent philosophy. Thus I will live forever.

I’ll make sure.

Eris is going to become Savathûn.