I was at the bottom of a rocky hill and there was a caterpillar-shaped thing making its way up the slope. It was bigger than a man. There was an outcropping of rock to my right that was about the same size as the crawling thing and when I looked closer I noticed that it was changing, becoming more and more caterpillar-shaped. Then it started moving too.  

They were ancient things, from a time before man. They had been in some kind of hibernation state for millions of years and now they were coming out, waking up, because it was the end of the world, or this version of the world. 

When they reached the top of the hill the caterpillars metamorphosed into four-legged creatures shaped like horses but with thicker necks and the heads of buffalos. They had manes. Something like a curtain made of shadow floated around their heads making it difficult to see much detail. They were intelligent and self-aware but very different from man, almost alien. They didn't care about us or our time here which was nothing, a blink of an eye, compared to theirs. They were here first. 

We [I don't know the others] ran into a nearby building (which used to be a school) and hid in the ceiling, observing the creatures through a pair of binoculars. There were three of them on the hill and they looked regal.