Rigara the Lost  

I've been trying to get this guy to spawn for his Taelosian Geomancy Stone Eril drop.
He popped today, same location as the previous poster. No stone though :(
Second spawn on the right in the first hall as the others mentioned.

I clear between 15-20 mobs to get all of the named (or their PHs, its random) to spawn in the trials. It doesn't seem to be a fixed amount but always in between there. The named or his ph can be seen from the first room in the hall so it's easy to tell if they have popped yet.

Named pops are very rare. Rigara spawned on my 13th instance and I haven't seen the Sludge Eating Fly even once yet. I grab a new instance after spawning either him or his ph, since the next respawns will usually have a lot of unsnareables when added to the first batch I skipped.
Muck covered fly and Stonemite are the only two mobs which are unsnareable in the first room so I usually don't kill them.
I can do the fly but the stonemites summon so I avoid those at all costs.

Soloed him as a 65 necro, he was pretty easy once the first room was cleared. I pulled him to there. Took 10 tries to land slow on him, he has high MR.
Undead so slowable by a necro. His max hit is about 1100 but he usually only doubles. Sometimes he triples but those are rare.
Summons. Partially slowable. Has about the same HPs as the other mobs. Enrages.

how about posting some details from the mob.
As whe can see in alla what he drops.

How much he hit for?
Slowable/snareable/mezzable?
Aprox hp?

Since the patch on June 16th, 2004, mobs no longer drop class-specific spells. Confirmed today that a Taelosian Geomancy Stone Eril does drop in sewers from this creature.

Dropped 65 Bard song: Dark Echo tonight.

Spawned in the first hall out of the zone in room (to the North) 3rd mob in the hall.

Dropped 65 Enchanter spell: Madness of Ikkibi and the caster bracer tonight.

spawns in the last 2 north rooms, being the room before Alej and the room Alej is in. it can pop in any of the spots in these 2 rooms, if u have the patience to clear there. Most jsut SOS rogue up to start the mission, which respawns the entire zone, with only 5 rooms being populated.

If u do clear up there, stop in the blistering larvae room, same deal can spawn in any spot in that room ( the south west room ) and i got a ft2 aug from it.

Random spawn like the fly or is this a staic spawn.. Anyone know? :)