taruu

The Island was redacted from the perception of outside world, via Wish Craft.

Wish Craft has the power to enable Time Craft. We see this primarily through Siffrin's timeloops, but also through the King's powers.

One of the King's powers is to show the saviors a "vision of the future."

...And this same attack is deflected back at the King by Mirabelle in ACT 5, in which the King is able to see the Island before being frozen in time.

...So. The King's "vision of the future." We're never told explicitly what this vision is. All we know is that it's apparently powerful enough to wipe the party in one hit, hearing it from a distance hurts your head, and that whatever Siffrin (and Loop) saw, they don't seem to actually be able to describe it. Even the King himself doesn't know what his vision entails.

We don't know whether the party all sees the same thing when struck by the vision, and Adrienne's answer to the question about it in the Reddit AMA is. vague? It's not a "no," and the specific wording makes me think the answer might be yes. But that's me reading into it.

Now. What do we know about the Island's redaction? The Island was affected by the wish recently, as in "like a decade ago" recently. We know that nobody in Vaugarde or the rest of the world is capable of thinking about the Island, anything closely tied to the Island's culture, or people on the Island for very long. When they do recall these things, they slip right out of reach. Particularly, the consequence for trying to think about the Island (or, more specifically, break the wish that forces the Island out of perception) is significant pain, localized in the head.

And that said pain is enough to become lethal, if pressed hard enough.

From here forward I'm running with the assumption that the King's "vision of the future" is not personalized to any individual, and is unchanging throughout the course of the whole story. Now. Remember the end of ACT 5, where the King gets hit with the deflected "vision of the future", and instead of dying, he recalls the Island and gets frozen in time? Very odd, yeah? Why wouldn't the King just die like everyone else does? He even does take 9999 damage when trying to say its name, like Siffrin does, and like the party does when they're hit by the attack.

Well. We know that he has a "true wish" that the ability to freeze Vaugarde in time grants. I don't think it's at all a stretch to guess that the King's "true wish" is to be able to remember the Island. My personal guess is that the King (and Siffrin) brought this "true wish" into effect via the "SAY ITS NAME" sequence- he even tries three times, a significant number in wishing.

The King (and Siffrin's) wish breaks, because it can't be fulfilled in this moment without breaking the wish to prevent the Island from being thought about. However. Consider the conditions at the end of ACT 5- the King sees the vision of the future reflected back to him, and what he sees is the Island. He remembers the Island, fulfilling his own wish, and is frozen in time. I consider this a compromise between his wish and the one binding the Island- the King gets to remember the Island, but nobody alive is able to think about it, because he's frozen in time; it's like the Universe is correcting itself (I WILL GET BACK TO THIS). The wish of all of Vaugarde to defeat the King is fulfilled, since he is no longer a threat, and Siffrin's wish wraps itself up soon after.

MY POINT BEING. The King's attack is a vision of the future. This "future" is of the Island, in some uncorrupted state. The saviors see it when he attacks them, and he sees it when it is deflected back to him.

The logical next question is "okay, so the Island exists in the future, but how do you know time shenanigans are even related to the Island?"

Recall a very odd series of interactions throughout the game, in which you try to interact with a piece of equipment that you already own.

The game rewinds slightly, before the item disappears, as the Universe corrects itself.

This is awfully similar to two particular events: looping back without seeing the death screen, and talking to the Daydreaming One about her sister. The latter is more interesting to me for the purposes of this theory.

In both instances, something is misaligned within the Universe (an item existing in two places, someone remembering something they're not supposed to) and it is corrected through some sort of rewind. Also compare the dialogue above to when you try to give Mirabelle the Stylish Bow when you already own it.

The world glitches, but Siffrin defuses the situation before the Universe has to intervene. Omitted from the screenshot is the fact that Mirabelle's portraits switch to happy from "catastrophically anxious" with no transition after Siffrin shows her where the bow is. Important to note is that when Mirabelle tries to recall receiving the bow, her head hurts, much like how trying to break the Island wish causes a headache.

The Universe leads you away from perception, and you can only follow.