If a quest can go wrong, it will go wrong for me.  And boy did this one go wrong for my 25 warrior.  I didn't even know it existed, but had to go deep into the Thistlefur cave to find troll charms.  Normally they spawn in one area and I can get them there, but this time I ended up going all the way in and found Ruul caged.

Ran out with Ruul, and we were doing fine, even when an idiot shaman trained two adds onto us.  Things got a little hairy at the entrance to the cave, as a Pathfinder was patrolling into the area just as we started fighting the two Ursas that stand on either side of the entrance.  This of course aggroed the Pathfinder and the nearby Totemic.  We got through that fight ok, and I thought we were done.

But no, had to walk him out of the village.  He very nearly aggroed an entire camp of furbolgs by walking too close.  Right before the village entrance, we fought an Avenger and Shaman.  Not a hard fight but left me at about 70% health.

I didn't have a chance to do any healing before he aggroed the village gate guards, two Pathfinders.  For whatever reasons, my warrior had a lot of trouble just landing hits on the Pathfinders.  We managed to kill one, but then a nearby Shaman joined in, along with what appeared to be a two Avenger/single Shaman three-man patrol, a wandering spider and the patrolling furbolg leader.  For those keeping score, it was 25 warrior and 26 Ruul against seven enemies.  Suffice to say I died quickly and Ruul died about five seconds later.  It was about to get even worse, as one of the furbolgs started to run off, straight towards the nearest camp.

You have no control over Ruul, so be aware that he will walk into situations above if the time is right.  To be safe, bring a couple of friends.