I hunted this area plenty of times for the Filling the Repository quest, and can say that any time I've ever seen it spawn, it was at loc 1342, 1020,... ph, (a crystalline exterminator).
85 WAR (100% Group Gear) -- Max AA -- ~5500AC -- ~40K HP -- Using Shield -- Bard/Clr/Shm buffed -- Slowed mob -- Final Stand Rk.II NPC: Conical Terror Fights: 7 (610s) HP: 1023K Avg Hit: 1765 (2560) Max Hit: 4320 (6264) DPS: 822 - 3000 (1644-6000)
i am not sure if this holds water but. when we where just killing the PH marked the named didnt spawn much. but when we killed all three of the "a crystalline exterminator" in the area he spawned more.
there are 3 other named in this camp if you have a good puller.
Most of the nameds, including Conical Terror, are marked on the ingame maps that can be downloaded from Raspers
Most nameds have many ph's, so what you find on Raspers is usually not the only spot that a named can spawn. As for Conical, i have never seen him in any other spot than the one marked on Raspers.
So after about 30 kills the common clay drop is wrist; icon Stellite Encrusted Carpal Clay (wrist) Every named has a chance to drop any clay randomly instead of its common armor drop. To say that this mob drops the arms is technically correct but if you are looking specifically for the arms look elsewhere.
The mobs other drops are fairly even in drop rate; icon Cowl of Fright icon Crystaldust Drape icon Shield of Coiled Terror
These are T6 zone global drops and should be remove and associated with multiple creatures.
icon Faintly Pulsating Crystallized Cosgrove Shard icon Braided Belt of the Bellikos