Alicornutopia

Is anything short of the Admin or some other Admin-level local omnipotence capable of nullifying foodvassalage?

Sarion in hyperfocus could ignore orders delivered during that time.

Secret.

Yeah, I didn’t mean her hyperfocussing her way out of avoiding existing orders.

You can’t square the food back to the satisfaction of fairy magic, but I imagine coins could get somebody out of food vassalage if you were creative enough. If nothing else, it’s been speculated that they could travel through time even if Bells have avoided this use case.

I’m also guessing Kyubey’s wish granting could do it and a magic might randomly do it. I bet Skin Deep style dragon magic could not, but sphinx magic and runecasting could. Would I be right about these guesses?

I don't have rulings on any of those specific cases that you should expect to apply in Effulgence but you're in the right ballpark, if a little more liberal about it than I would be if it were only up to me.

Medallion type dragons can anti-magic vassalization?

No.

What about metaravelry? I’m guessing also no, and that neither answer changes even if the master wants the vassalization gone.

Indeed.

The most I might let metaravelry do is mess with food vassalage that is above and beyond standard food claims - so leaflet fruit, berrybushes. Wouldn't help a mortal; might help a fairy.

That sounds interesting. Would you also let it affect sorcerous things like gates, or affect kind magic unrelated to vassalization?

Would Gem's time travel revert her to an unvassaled state?