How to setup a fading shader?

[CrimsonSealArt]

Hey follks, new Blender user here. I have assigned those 4 faces with a glow material. However, what can I do to fade out the highlighted area and reveal another mesh underneath?

[MarioPeper]

How about this (cycles)

[CrimsonSealArt]

Thanks, this is what I am looking for.

[CrimsonSealArt]

Hi MarioPeper, is it possible to add an emission node into this cycle? If so, where should I add it?

[MarioPeper]

The emission slot is in operation, maybe you mean glow. You have to do that with cycles in the compositor. Or you compositing it with a eevee render