"Maybe very mild something."

"There's some foods that nobody knows how to conventionally concoct, but demons can do it, I'm thinking of a mostly soy thing, sort of yogurty, I like it cold but some people drink it hot."

"I'll try it."

It is indeed sort of yogurty. Tart, umami.

"It's good. Thanks."

"You're welcome."

"Karin thinks I should recover fully in three or four days."

"Ninja convalescence speed, gotta love it."

"It's usually slower. Tobirama's very pleased with himself over the chakra exhaustion treatment he made."

"I'd send him a fruit basket but he can't eat."

"I think he'd rather have a challenge."

"Ooh. Like what kind?"

"Technique development, probably? Though he also seems to like figuring out technology."

"Is he not coming up with enough challenges for himself in those departments?"

"He goes through them fairly quickly."

"Maybe I will find him something fun. Not sure immediately what to pull out."

"If there's anything that strikes you as an area that needs addressing, I guess."

"Interdimensional travel, negotiating contact with space aliens, ending all the stupid ninja conflicts..."

"I think he has interdimensional travel but not alien contact on his list, and it's hard to invent your way to peace."

"There might be inventive stepping-stones. Like, I don't know, something that'd make techniques not work in an area, and then people in that area don't have to worry."

"I think you'd probably break a lot if you tried to stop techniques in general, but I see your point."

"I'll suggest it." Cam shoots Tobirama an email about the concept of an antimagic field on his way out.

He fairly quickly gets back,

Only if you felt like killing everyone in it. Some seals can stop people from expressing chakra externally if applied to their skin, and some seals can drain the chakra of everyone in them, but both are extremely dangerous to the people targeted.

Yeah, you'd need to somehow figure out the chakra addiction situation everything here has. People in my world do not seem to have this issue.

My instinct is that can't be done without removing someone from the magic system entirely and perhaps permanently. It'd be more like invasive surgery than a field.