You can get the infernal meteor as a projectile I believe
Open up World Editor
Go to object editor located in "Module"
Click the desired unit you wish to have the meteor.
Scroll down to "Combat - Attack -1 - Projectile" and double click
In the menu that pops up, change the "unit - missiles" to "Spawned Effects"
Scroll down to "InfernalMeteor", "InferbalMeteor2", or "InfernalMeteor3", Select one (I don't think there's a difference.) and press ok
and voila! You have an infernal meteor as a projectile.