Exhibit IV: The Tylwyth Teg’s Sentinel

Ah… still here, are you? I suspected you might linger. Exhibit IV has a way of settling in the bones. Step closer again, traveller — not too quickly. Some stories prefer patience.

You’ve already seen the sentinel. That worn Welsh stone, its hollow gaze fixed somewhere just beyond us. Many dismiss it as folklore made solid. A curiosity. A rustic superstition dragged into the light. But I have learned — painfully, over many years — that the oldest objects rarely survive by accident.

You see, boundaries are delicate things. Not just walls of stone or lines on maps, but agreements. Understandings. Quiet acknowledgements between worlds that were never meant to overlap too freely. The people who placed that head in the wall understood this instinctively. They didn’t worship it. They respected it.

Rhys did not.

Ambition makes a convincing argument, doesn’t it? More land. Straighter walls. Progress. Sensible improvements. He thought himself modern. Practical. Above the whisperings of old wives and shepherds. And for a brief moment, it must have felt like victory — the wall extended, the pasture widened, the old guardian discarded like rubble.

But land remembers. And sometimes… something else remembers too.

The souring milk, the uneasy livestock, the strange music under the floor — none of it violent at first. Just warnings. Gentle taps at the edge of perception. A chance, perhaps, to reconsider. But arrogance has a way of dulling the senses. By the time the lights danced across the field, by the time his son vanished into that impossible silence, the conversation was already over.

When Rhys dragged the stone back, broken by grief, he wasn’t restoring masonry. He was repairing a promise he hadn’t realised he’d broken. And the return of the boy — alive, yet altered — well… that feels less like mercy than a reminder. A mark left behind so the lesson would not fade.

Look again at that hollow eye. Go on. You may notice it does not appear entirely empty. Just depthless. As though it looks not at you, but through you, measuring where you stand. On which side of the boundary.

That is the purpose of a sentinel, after all. Not to attack. Simply to watch. To remember. To ensure the line, once drawn, is not forgotten again.

So we leave it where it rests. No more interference. No more clever improvements. Some artefacts serve best as warnings, not possessions.

Step back now, traveller. Carefully. And when you return to your own familiar paths, tread them with just a little more respect than before. Not everything unseen is imaginary… and not every boundary is meant to be crossed.

My duty, once again, is done. The story rests with you now. Carry it lightly — but not carelessly. This museum, and its Keeper, will remain… should curiosity bring you back.