So, "The Song of the Shadow" is an Essence 10 charm that allows an Infernal to create Celestial (Solar-level, t'boot) Exalted. As many as they feel like, albeit only upon people willing to give up their free will in exchange for superpowers and not being a worthless dirt farmer anymore (I'm sure the line will be very short). This charm has six prerequisites, starting at Essence 6 and going up from there.

Where exactly would you put a charm for making essentially Terrestrial-but-using-my-third-circle-souls-instead-of-the-elemental-dragons-as-a-template Exaltations?

What about the ability to make, say, 100 shard-based Exaltations, but with the same level of power as Terrestrials?