Normal English capitalization rules. Everything is lower case unless the monster name is
- Rank (e.g. Centurion, Legatus Legionis, Lord Guardian)
- member of a military or other order (e.g. Wind Rider, Seal Guard, Guardian (of Ulm) as opposed to e.g. heavy infantry or infantry of Ulm)
- unique monster (e.g. Eater of Gods, King of Banefires)
- commander is not capitalized because that is too much of a generic descriptive rather than rank
As I said, everything will get reviewed when I work with the description files, but I did pay a lot of attention to this issue.
Spell descriptions (not in that text file) will have the names of all monsters they summon capitalized for clarity.
The selection of appetite/appetites depends on the context, but both of those are normal English. I'd elaborate, but I have early morning shift tomorrow and I need to hit the sack.