老人们警告我们不要靠近那座森林，据说那里有恶魔出没。

The elders warned us not to approach that forest, as it was said to be haunted by fiends.

fiend 是名词，本义指"恶魔、魔鬼"，在宗教或神话中指邪恶的超自然存在。这个词源自古英语，常用来形容极其邪恶或残忍的生物。