I'm pretty new and most of the posts are about ink stone or whatever

No, No you cannot eat Inkstone. Inkstone is an extremely rare and extremely powerful magic

There are two ways to get it. 1: Being born with the magic. Being born with the magic is how you get it at it's strongest but it's also the rarest way of getting Inkstone. The second way is being Injected with it, Injection is a better way of getting Inkstone but it makes the magic much weaker and even requires the injected user to find and use amulets to be able to get to certain phases

done

hmm ok knifeboi's only magic attack is flight but I think he has an amulet somewhere

It has to be a specific Amulet, the amulets are rare and can usually be found at the dark market