"Why not?"

"We're immortal."

"I don't want to interact with the vassalage system, but if it is otherwise unassailable, I will."

"Maybe with your weird powers you could get the Queen."

"Who is the Queen?"

"She's a one-of-a-kind fairy whose kind magic is to know every other fairy's name."

"Useful. But she must be extraordinarily well-guarded."

"Yes, but not against your thing. Fairies can't do that."

"The mind trick works better on the simple. You, I think, would be resistant to it."

"Oh."

"Can you tell me how vassalization works, exactly?"

"Given a pair of people at least one of whom is a fairy, vassalizations may occur in either or both directions. There are two ways, names and food. Food has a fuzzy system of 'claim' on it, having to do with who planted, grew, harvested, prepared, or, most importantly, is holding the food, plus what world it's from. If you eat food with claim on it, fairy food for mortals and mortal food or certain strongly claimed fairy food for fairies, then if it's a strong claim you will, and if it's a weak claim you might, become vassal to people with claim on it. If you ate a haw from my tree that would be a strong claim from me, if you ate any random fairy food directly out of my hand that would be too, if you just picked and ate a plant I'd never interacted with I probably couldn't use that but another fairy maybe could. Similar the other way around except I think mortals never have anything like my tree is for me. Food from someone who is already your vassal is safe, so food vassalization is never two-way. Impure water and inhaled stuff can theoretically also do it.

"For names if a mortal or a fairy know all of a fairy's real name, or if a fairy knows at least one syllable of a mortal's real name, that creates a vassalization too. Fairies are very good at remembering names compared to mortals and can tell if a given name is real or not on inspection."

"If I planted a tree in Fairyland, could I assert a claim on any fairy who ate fruit therefrom, even if I did not see them eat it?"

"Yes but it might wear off if you didn't issue them any orders."

"Does it have to be ingested? Would injections of juice work?"

"That works."

"A team of commandos, with modified dart guns and hermetic armor. I'd need to secure appropriate ammunition, and craft an order set..."

"They have to be robust against sorcery and kind magics, not just forcefeeding."

"What is the range of capabilities of those?"

"Substantial. I could turn you into a frog, or freeze you, or heal myself if you hit me with that glowy thing. The Queen will have better sorcerers than me. There are kinds who can't be forced to let go of things they have hold of, or whose claws can cut anything, or who teleport short distances."

"How does one counter sorcery in your world?"

"We need to know what we're doing and where we're doing it; if you interfered a lot with a sorcerer's senses they would have a harder time casting."

"Smoke grenades and flashbangs. Active camouflage. Perhaps certain rituals; that bears testing. They would require preparation but may yield best results."

"I really can't list all the things she might have set up. I've never been there."

"Then we practice on a smaller court first."