Borderlands 2 Monster Mash Part 2 can be acquired by speaking to Zed in Sanctuary at the end of Monster Mash (Part 1).
In Borderlands 2 Monster Mash Part 2, Zed tells us he needs more creature parts, and just like the last time, discretely as possible.
Dr. Zed is paying you to retrieve even more creature parts for him. He still wont say why.
Item: SMG / Grenade
Experience: 3715 XP
When we activate Borderlands 2 Monster Mash Part 2, we have to get to Arid Nexus Boneyard.
Depending on when we activate this mission, we may or we may not have access to this area.
Once we have access, we jump into a vehicle and we hunt down some rakk birds.
They will drop pieces required for Dr. Zeds experiment, hence we collect four of them.
After that, we have to kill skags to also collect four parts from them.
Tip: We can also get the animal parts from other areas. For example, assuming we work on the story mission that opens the Arid Nexus area, we can definitely get the rakk parts from Eridium Blight.
The objectives area easy to complete and shouldnt take too much time.
Therefore, when we have the required parts we can get them to Zed in Sanctuary to finalize the Borderlands 2 Monster Mash Part 2 mission and unlock the last one in the series, Monster Mash (Part 3).