Anyone else notice these guys are similar to the monsters in the Aliens movies? Think about it, the way they look, the fact they come in swarms, the place they inhabit, the way they move....
at lvl 29 they give sweet exp solo and the swarmleader has some sweet loot when he pops but at lvl 29 i was taking thim 4-6 at a time with little problems it took me about 15 mins to get from 29 to 30 well 1 blue bub exp from 30 but i would recumend this zone at lvl 21in group to 30 being twink helps as well
I was soloing with my monk in here at level 22. Some of the drones were yellow, some blue, but they all fight about the same. I was fighting a yellow netherbian, but he was doing very well and had me beaten, so I had to feign. As I lay there with a handful of hp left, I watched the netherbian's hp bar in my target box... and I swear that as he walked away, his hp regenerated enough to jump past two letters in his name! I wish I could regenerage half a bubble of hp every tick...
If a mob is not aggro on anything, it regens really fast. Even a pet at level 12 regens 10+hp a tick when it's not fighting anything, and that pet only has like 120 hp.
Killing these suckers. They seemed to be in it for the XP, not the loot, because they killed loads and loads of these things (and other similar creatures in the cave) and leaving the bodies without even picking up the change. Well I waited around and ninja'd the corpses, to my surprise they drop 1-4pp in change, plus the standard words/runes etc. I'm not sure what all they drop, but because these swarm you about 6 mobs at one time, you had better have a good group to take them on - when you do though, nice loot. I think they hit for a max of 40 or 50, normally around 20ish.