Rumors from Eastlight Isle lead you to a cavern along the coast that "appears and disappears" according to locals.

The cavern isn't the only thing that's disappearing. People have been going missing. Based on what you've seen so far, this makes you think of Tidebound involvement.

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Crucible Warning:
This is a Crucible Adventure Type. That means that this is a high-risk/high reward type of adventure and will be near the top of the difficulty/deadliness curve for its level range. This adventure will be difficult, even if the party is well-rested AND well-supplied. This warning will not appear on every Crucible moving forward.