This pattern emphasizes the noun that it's attached to and indicates a piled on condition. It usually is used in a negative connotation.

- attaches to nouns

Examples:
추운데 바람마저 불었다./It was cold; on top of that,the wind was blowing.
사업 실패로 집마저 남의 손에 넘어갔어요./His business failed and he also lost his house to a stranger (in addition to his business).