I looked up through the forward viewing ports again, but saw only the dark vapors I'd thought were simply clouds.

Her veil continued to flutter as she spoke her incantation, but the only thing that came out from beneath it were clouds of dark vapor.

There was a little puff of dark vapor that quickly dissipated in the air.

This dark vapor, too, poured into the air, growing like a living thing, writhing and twisting its way upward.

Then the night came up in dark blue vapour from the snow.

But the rising sun turned it into mere dark vapour, a doubtful, massive shadow trembling in the hot glare.

The thundercloud had become a vast wall of dark vapour, lit by frequent flashes.

Two unblinking, yellow eyes glowed within the cloud of dark vapor.

From the floor ascend pillars of dark vapours.

Clouds were headed this way, mean little gray ones with tentacle-tendrils of dark vapor.