After wandering around a bit at loose ends, I found the quest hub for the upper teens in Kojan--man, did I ever find it. It's called the House of Fallen Leaves, and it's against the eastern mountains across the island from Jeric's Crossing. There are only four quest-givers in the place, but two of them have about eight quests each. Oddly, though a number of these quests are marked "Small Group", I did the first cluster so marked perfectly well on my own; I ended up teaming with a random necromancer just because he was there, but I was having no trouble at all killing the required mobs on my own as they were only two-dot types and one or two levels below me.
Have I mentioned that I'm loving playing a monk? I had a moment's hesitation over picking a style at level 15; dragon sounded cool in the hitting-things way and drunken monk in the "you can't hit me" way, but I ended up going with harmonious body just because it seemed more "monk-like". (The style trainer, by the way, has been excellently programmed to be an ass; in-game, what kept me from telling him off was that he's the only one who can teach what I wanted to learn. Out-of-game, it was because he's an NPC and wouldn't have cared. :) Monks also get the all-time number-one most useful ability: Feign Death. No cooldown time, even, and it doesn't seem to be resistable (or perhaps I haven't tried it on any mobs that are of high enough level to resist).
I have discovered that the skull I got from the big nasty panther (I was poking around the cliffs around Jeric's Crossing and got randomly attacked), while it is a quest item, is not a quest item for me; it's something shamans need for their style quest. So I can ditch it. I just wonder why the item even drops when it's not something I can use.
> I just wonder why the item even drops when it's not something I can
use.
This is Vanguard, not WoW, but the principle's similar.