I doubt you know the hive better than the actual hive. Oryx's court being allowed to openly challenge him to combat, and the final card of the Books of Sorrow discussing his feelings about his potential death clearly prove that their philosophy was not just mere talk to him.
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The grimor says it, they seek death as final form of life, the strongest an fitest thing is just among them thats why they keep killing and figthing each other
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Can you tell me which card? I'm very interested since there is not much detail on the final shape, but I'm inclined to still disagree with you because of Book of Sorrows XXII where Oryx says "And what is that final shape? It is a fire without fuel, burning forever, killing death, asking a question that is its own answer, entirely itself. That is what we must become." Particularly because of the killing of death portion. To kill death is to remove death.