This mob spawns at 2126, 650, 223 Location is the first left/right split when you enter the caves. Spawned on the left of the round pillar thing in the room.
I've seen this guy pop in a few different spots, from wanderer PH's to static, both in the left side, right side and centre of the netherbian caves. Uber rare spawn. I'd estimate 1 in 200. Hive fiend and Bile Spew are also random spawns. Bile spew being about as rare and hive fiend being about 5 times more common (1 in 40 or so). He is a Necro and can gate.
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Marshall Stamm Bladecaster - http://eq.magelo.com/profile/1280962 <Temerity> - http://www.temerityguild.org/ on Al`Kabor for EQMac...the closest thing to a "Classic" server that we'll ever see. http://www.eqmac.com/forums/index.php
Was found as a wander in the left half of the northern alien caves in UP, It WAS a wander so perhaps any wander on than side of the cave is its PH or just one, or ALL the aliens.
Approximately, 40k hit points.
Attempted a true solo with my 65th wizzy, but my mana pool was insufficient to kill it, via self runes/rooting it backing up and nuking it. Took in a way overkill group of 65ths to kill it later.
It likes to cast and will spend much of the time doing so. Appeared to be a necromancer. It doesn't hit too hard, about the same as the other aliens but has about double the hits. I'm sure some classes can solo it much easier, although they'll have to watch for wanderers.
Look under the swarmcaller. This mob is the 3rd named pop in a cycle in the neth caves. Do the cycle you can end up with an ear ring, a bracer, and a weapon....even if tarwo isn't up.