When the egg washes ashore, as it always does, someone finds it. Sometimes it’s creatures of the land who have no idea what the creature inside truly is, other times it’s island dwellers that worship it outright. As an egg.
Lately, a sea witch has taken to snatching the egg away before it can wash ashore at all, raising the creature inside herself, apparently dissatisfied with those above the sea tainting the child’s heart over the lifetimes it’s been around. It’s hard to say if this is better for it or not. I suppose we shall wait and see.