Level range is ~9 to 12, and hit points range from the mid 250's to low 300's. Erud's Crossing is probably the best place to hunt these, but also the most dangerous, as there is nowhere fast to zone to. The zone, for the most part, is non-aggro. Be careful of any undead you see or madmen. Other than that, you should be safe.. DON'T KILL THE BEETLES! =)
Sorry, but they will foloow you onto the boat. I found that out the HARD way...1 chased me onto boat, i couldn't cast, so had to get off boat. Then, as boat began to leave, I barely got on in time. Wisp was left behind...but the island is a great place for money and there are also some zombie sailors nearby to hunt. vampire bats, too
When these start to run from you they frequently teleport to the "safe" spot in the Qeynos Hills zone, over by the zone to Qeynos itself. Hardly worth fighting them unless you start out near that spot.