Much like the previous coffins, this coffin is on the map as a gray question mark on the map. However, unlike other levels, Moonspell has buildings and a mountain (surprise!), the coffin is in the building in the upper right.
Instead of a circle of enemies spawning when you approach, a large skeleton spawns. Doesn't move very quick, and is a pretty simple enemy. Once defeated, the coffin will open and Miang is yours!