It’s because…; that’s why…An informal ending used after a noun ending in a vowel to explain a reason. For example, 제물이라서 그래 means “It’s because it is a sacrificial offering.” The related polite form is 라서 그래요.
KO: 사람을 제물로 태운 곳이라서 그래.
EN: It’s because this is a place where people were burned as sacrifices.