Originally, there's a stat and a basic move, then a new hold-economy, and yeah. It was lame.
Instead, I came up with this:
When you channel the Field to commit acts inhuman and graceless, tell the Field what you want, what you need.
You can't refuse its gifts; your reciprocity is expected in equal measure.
What it asks in return is dictated by your Moth.
Pick a flavour:
Jealous
It seeks to be the only thing in your existence. It questions your commitments. It demands fidelity.
Voracious
Offer up more bodies, more wealth, the firstlings and the fat thereof. It wants to suck the whole of your being out with its caresses.
Seductive
It pulls you in closer, deeper, softer, wetter, further and further with the waters of the birth push.
Vengeful
Hush, beloved. We'll see to it that there is blood to paid for crossing us.
Monstrous
It transforms your body into its home; your soul its skin.
Cruel
It rarely cares for your petty wants and desires, sleeve.
Secret
No one can know about us. They'll ruin it; they can't be trusted.