The correct spelling for this NPC is "A Monstrous Earthwalker", not "A Monsterous Earthwalker".
[Mon Mar 22 04:37:57 2010] Targeted (NPC): A Monstrous Earthwalker
I found it already up on the western wall of the zone, at location (/loc): -665, +720, +22 .
I believe this is a spawn trap spot, with the PH name "A Mudified Earth Golem", as that mob spawned while I walked over it, at the same location as this named (A Monstrous Earthwalker). Likely there are other trap locations for it but I have not found them.
It dropped "Rock Adorned Stud" (already listed) and "Spectral Parchment".
Rondor
Edited, Mar 22nd 2010 5:45am by RondorNorador
Edited, Mar 22nd 2010 5:47am by RondorNorador

Rock Adorned Stud
Spectral Parchment