I'd say it is worth +1 or +2 at most:
-Finding out the Catch requires interacting with the Emissary in person, and actually finding out that he is the emissary of an Earth dragon. Unless that part is really obvious and well known, the catch is worth +0. If his status as an Earth Dragon emissary is obvious, then the catch would be worth +1.
-Hardwood may be easy to come by, but actual wooden weapons that are worth a damn are not. The opposition would be limited to weapons with a value of 2 or less (batons, nightsticks and staves), and most ranged options are right out. Therefore, access to lethal wooden weaponry is rare, making the catch +1. Unless the definition of "hardwood" includes Ogres using Sildenafil citrate, in which case +2 is fair.
TL;DR: If the power the emissary is serving is really obvious, the catch is worth +2. Otherwise it's +1.