I think 9 was the lowest for them, and seems more common in newbie areas to be low, not sure. But where they spawn in numbers, in NK for the farm, you will often still be getting xp off the kill at lvl17. You can keep handing them in until low-mid 20's.
At lvl14 you can kill them with less trouble as blue con. And since guards wont help you when you run to them trailing willowisps, that sow will come in handy to the zone line.
Don't count on NK too much though. It's good if you have an alternate character to play, but if you only have one character on the server, NK can be a real pain. Prob is on the emu there is a pathing problem/bug with mobs, and players can run-strafe to avoid being hit. People roll bards like mad to take full advantage of that, they swarm kite and use strafe so the tears won't well up dying so often if the bug were not. So basically, you could at times face a low-level bard there (or two or three) taking all the spawn in the area, running off with it all for 20-30 minutes at a time (blocking the respawn leaving zilch) as they are kittens at actually killing their swarms off. At least at lvl14 with sow, you can chase them down and peel off mobs from their mega swarms. The amount of time they hold those mobs, they could have been killed and respawned a few times
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