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Every block he places in his base, xB feels more whole, more realized.
Most people who end up getting that feeling don't know what it is, right? xB does.
Of course he does! How could he not, when he feels fuller every time he runs the Guardian farm, when his teeth start looking like his walls, when he can feel it mold into shape every broken block? His base has become him.
He hasn't become his base, though. Those new teeth might seem like a sign of it, yes.
But he knows his true form's fine. And that's the difference.