It's an animated procedural glowing material. There are two empty objects used as controls for pattern and brightness change, brightness curve is only a reference that allows to see more accurately how it's going to change in time.
I've used external environment texture, here's the link:
http://timothykurek.com/wp-content/uploads/2017/10/dark-background-vectors-photos-and-psd-files-free-download-on-dark-black-background.jpg
And here's the animation itself:
https://vimeo.com/251729166
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