Dark Summoning Circle Model?

Hey everyone,
I recalled seeing someone use the circle which appears under units while using the Dreadlord's old ultimate, Dark Summoning, for a custom spell graphic, and though I've skimmed through the listfile and the spell art entries in the object editor, I cannot seem to pinpoint the name of this model so that I might use it myself. Can anyone point me in the right direction?

- Lazurus

I knew I had written this down somewhere, but I seem to have lost it. If you get really stuck with the answer though, try PMing Chrydgod, he knows the location.