The extra rules for Encounters is found at the beginning of Wildlands.  I still refer to Boons because that’s what the original fan hack called them.  The version that made it into Wildlands didn’t call them that, turned it more into using successes in Encounters as degrees of success to determine how helpful the NPC is.

I liked the boon system better and that was the root of my Encounter rules.

My rules summary (which is no longer pure RAW) is here:  https://dl.dropboxusercontent.com/u/24672299/Ralph%27s%20One%20Ring%20Reference%20Guide.pdf