Six figured it out I think
It is possible to pick the pocket of the Druid who greets you in the Grove. It is however, fiendishly difficult. You need mad timing skills, an oil of speed, careful party placement, and, you must try it before he makes his speech. You need over 200% in Pick Pockets to even have a chance. He also carries something else, but, I have yet to actually fish it out of his pockets so I don't know what it is yet. It is also impossible to kill him, as he vanishes instantly.
I learned this with a Bard. He tried to pick pocket everybody in the game. And I mean everybody. When I finally got the message "Pick pocket failed" I knew he had something, maybe something I wanted. It took me probably close to 50 attempts before I realized, I did not have enough pick pocketing skills. Drinking PoMT is chancy, while trying to drink them right as you enter the Grove, he spawns and your chance is blown. After maybe another 20 to 30 attempts, I finally got some sort of timing down, and, in one lucky shot, happened to be in the right place at the right time with enough skill. The moment he started to spawn, I paused the game, and tried to pick his pocket. He luckily spawned right next to my Bard. I managed to filch his ring just before he spoke. In further attempts of trying to see what else he has, in a moment of pure luck, right as he was starting to walk away, I managed to try and pick pocket him again before he vanished, getting the "Pick pocket failed" message again, meaning he probably has juicier loot, but I doubt I will ever find out exactly what it is. Perhaps he carries the Druid quest items? The Root of the Problem and the Ring of Protection +2? I don't know. Perhaps the Staff of Thunder and Lightning?
It makes me crazy wondering.