You the first part of the cult mod - headhunters. Kill the enemies, collect the head and carry on store.
Installation Instructions: Download And Install The V3.0 Client Side Pak, Then Unzip This Into Your Hh Directory And Read Server.txt And Server.cfg For Help. If you have installed the DaPak maps addon, install to a directory other than Hh, rename the Pak1.pak file to Pak2.pak and place into your Hh directory.