Vernon is located with the other Creep Reepers, just outside of Expedition 328 camp. His PH is the Creep Reeper that wanders under the mechanical Arch. Directly outside of the arch is another Creep Reeper standing next to a Super Plated Gnomework, who is the PH for the named mob Creep.
Your facction standing with - Creep Reepers got worse - Expedition 328 got better - Sporali Collective got better - Deep Sporali could not possibly get better