Nerubian Obelisk
The Nerubian Obelisk is an archaeology keystone. It acts as 12 pieces of Nerubian Archaeology Fragments in research on Nerubian archaeology finds that have 'sockets'.
Source
The Nerubian Obelisk is an uncommon find when surveying Nerubian archaeology sites.
Patch notes
Patch 4.0.3a (2010-11-23): Added.