Quest Start
To sum up my study of Fire Demon, 'swallow' in the sentence means literally, you swallow something, rather than a metaphor. It's worth a shot!
You look like one of the best magicians who deals with fire. You can get Fire Demon that you long for, if you are willing to trust the book.
It won't be easy. As an elder magician of Ossyria, I can give you a clue about Fire Demon. Would you like to get Fire Demon magic?
If you want to get Fire Demon magic, go to see the keeper of the snow mountain in El Nath, Adobis. I'm sure if this book is real or not, but it's worth testing it!
If you don't want to do the work, then you don't deserve Fire Demon.
Quest Complete
What can I do for you?
Magic book? Fire Demon? I'm not a magician so I have no idea. One thing for sure is that humans can't drink lava. Humans can't even make the container to drink lava. That's nonsense.
Although...there may be someone who can make it.Vogen is the best blacksmith in El Nath. Do you know him? Maybe he can make a bottle strong enough to carry the lava...