Plural form of erlking; multiple supernatural elf-like creatures from Germanic mythology.
English pluralization of the singular 'erlking,' maintaining the German mythological reference while making it compatible with English grammar rules.
The fact that we have both singular and plural forms shows how English adopted this German folklore term wholesale—it's rarer to see mythological creatures from specific cultures get this kind of grammatical domestication in English.
Complete word intelligence in one call. Free tier — 50 lookups/day.