Song Jian's Law of Years clearly restrained the Skeleton King's Aging Law. The Skeleton King, already grievously injured, had nearly entered a dying state after being cleaved by Song Jian's divine meteor skill. It couldn't withstand the erosion of the Law of Years at all.
The Skeleton King's physical body was actually in a sealed state. Although it was a Demi-God Level powerhouse, it could only use a petrification-like seal to protect its physical body. Today, however, its body, along with the seal, was completely eroded by the Law of Years, turning into a pile of ruins.