How do i add a hero glow to a unit?

[Darkfang]

Well my friend, i saw a map (battle for icecrown 1.12e, an abandoned map in fact), where many non hero models had glow, i know it is added, so it comes to a queastion...

How do i add hero glow into a unit sir?

 

[Skycraft]

Attach this to it -> Unit Hero Glow.