Working on bringing a new concept in with the Riders Signs. Not linked to the Riders really, but a method of reading and understanding body language that is ‘encoded’ in a way. I like to imagine that Brom, Arya and Glen spent years working on developing it between them, and once they had it down they spread it to a select few trusted members of the Varden and elves. For when even Riders Signs would be too obvious, in case of capture and oaths, it combines body language, small facial tics, muscle movements, and, most importantly, relies on the user having at least some previous experience with mental communication and direct eye contact.
It’s basically reading micro expressions but with more direct and specific words rather than involuntary emotions. When free to do so the sender can ‘pulse,’ sending a simplistic thought phrase that lingers like a ‘ghost’ due to the visual cues indicating the idea or thought pulsed out. It does not require lowering mental barriers for either on the message chain, though clarity is improved when the sender opens their barriers to send the pulse.
The pulse has a limited range, and thus is not a true requirement of this new method but it helps when the recipient or the sender are not completely comfortable with the method yet or when more complex things need to be communicated. Even with a pulse, these ghost messages and visual cues can only communicate a handful of words at a time, usually only one or two sentences.
At this point, Eragon (and Saphira) are unaware that Brom has been subtly teaching them this odd language without words. He didn’t want them having knowledge of what it really was just in case they were captured and Eragon’s mind was broken. This Eragon understands but has no idea how or why.