You had been exploring the world when you happen across an odd structure. It has no doubt been lost to time, with some of the wood obviously rotting in the middle of the trees that surrounded it. It seemed to be a home of some sort, though it was destroyed and withered to such a degree that it hardly resembled such an area of comfort. It seems to have multiple stories, two at most, so you take to ascending its levels.

Climbing up overgrowth and vines, you eventually come across a chilling structure. It was the usual T formation of soul sand blocks to create the summoning structure for the Wither, though on the top-middlemost block, instead of soul sand, was a Command Block. The orange block sat ominously, its inner mechanisms blinking and humming idly.

These blocks, they're...not easy to come across. Nay, they're not even craftable by normal means, unobtainable without cheating. It would appear that a long time ago, someone had brought this block here through likely-dubious means, and seems to have experimented with it with a Wither, placing it in the middle of the soul sand formation. However, it was unfinished; although two wither skeleton skulls sat on the top of the T formation, the third and last one sat on the floor, next to your shoes.

When you looked at it, you could have sworn that some sort of vision--or, well, sound, played in your head. Something like the distant sound of air raid alarms, or an alert for major weather conditions.

It's a bad idea. You really shouldn't do it. You found this structure, and you have just as much freedom to leave it alone. You could forget about all of this and forget about ever exploring this way. If you do desired, you could even take the third skull with you and make sure no happenstance causes it to fall upon the top of the Command Block.

...But.

But what if you did put it on top?

Call it the call of the void, but there was an itching and utterly human urge of yours to just...see what may happen.

Still, the skull sits. Its withered jaw opens with a quiet creak, either from extreme age or being able to muster enough will to seemingly move on its own.