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I have a Warlock in the party, and the party came across a message on a fallen enemy. It was written in draconic, and in code.
The Eyes of the Rune Keeper allows the Warlock to read the draconic, But does Eyes of the Rune Keeper allow the Warlock to decipher the code?
Maybe as a side question, if a note is written with a subtle subtext, much like in the way that Thieves Cant is spoken, does that also count for Eyes of the Rune Keeper?
The Eyes of the Rune Keeper states that (emphasis mine):
You can read all writing.
This by itself leaves some room for interpretation. Fortunately, we have more information. The Sage Advice Compendium has a question on this feature:
Does the Eyes of the Rune Keeper invocation work on magical runes?
Eyes of the Rune Keeper lets you read any form of writing, including the linguistic meaning of a rune, if any.
Jeremy Crawford also answered this specific question in this tweet (note that Jeremy Crawfords tweets are no longer official):
Eyes of the Rune Keeper lets you read all writing. That doesn't mean you understand a secret code being delivered by that writing. For example, you might read, "Sunset Dog Potato," and have no idea that's code for something. #DnD
Taken together, this to me suggests that the warlock understands the literal meaning of what is written. Any subtle subtext or special symbols that are not related to a language would not be automatically understood.
Though it is ultimately up to the DM, I would say that in the context of the invocation, you would be able to read codes, including thieves cant. The invocation says (PHB 111, emphasis mine):
You can read all writing.
I think some people don't understand that to read something, means that you understand its meaning. Oxford dictionary defines read as (emphasis mine):
look at and comprehend the meaning of (written or printed matter) by mentally interpreting the characters or symbols of which it is composed.
Thus, when you can read something, you can understand it. Furthermore, the invocation states (emphasis mine):
You can read all writing.
Let me provide you with the Oxford definition of all (emphasis mine):
used to refer to the whole quantity or extent of a particular group or thing.
In this case, the "particular group of thing" is writing. Ergo, "all writing" means the whole extent of written things. So, anything that is written is included in this. If a specific code, thieves cant, or any other jargon is in written form, it is included in "all writing." Thus, anyone who has the eyes of the rune keeper invocation can understand its meaning.
