Well, there are actually quite a few but the most popular is a gloomy, decaying setting such as castles or haunted houses.
He ran into a burning church to save children he never met before
I believe that the answer to this question is:
Sudden as hungry wolves the kids purloinOr lambs, which haply some unheeding swainHath left to roam at large the mountains wild
This is because a simile uses the words like or as.
I hope that this helps if you have any other questions feel free to message me!
