The Dangerous Man!

The crystal was looking silver in colour at first before it turned slightly red. The red colour intensified with time, but it stopped just when the redness became slightly like blood mixed with water, faint and wasn't like the fog the man released before.

A portal did open, and the man vanished through it. And yet the red fog he released still lingered in the air. Before he'd left, he mentioned something about the incoming disaster to hit the city, and he spoke in a weird way about the five crystals he gave to these foolish city leaders, hoping they wouldn't use these fast to give more time for his scheme to finish.

Then he appeared in a vacant space, one that looked like an opened turf or something. It was filled with nothing, looking quite barren, without plants or vegetation, without any sign of life.