DotA Allstars 5.60B Death Prophet

Okay in DotA Allstars 5.60B there is a hero for the scourge called the Death Prophet. At level 6, she gets this spell called Exorcism, where green, transparent banshee/ghost things fly around her and kill stuff. I was wondering if this is a custom spell done with triggers, or just renamed? I would like to use something like it in my map, but don't know how. If it's renamed, what spell is it based off?

It is based on the Locust Swarm, the ultimate spell of the undead Crypt Lord. No triggering is required to get the effect.

Thank you.