"The Once and Future Slab" is the Chapter 12 story mission in Borderlands 2. You get it after completing the mission Wildlife Preservation.
Contents
Objectives
Description
Story Mission
Optional: No
Locations
NPCs
Enemies
Mission Debriefing
With the Slab bandit clan on your side, destroying the Hyperion bunker that defends Control Core Angel should be relatively easy. Emphasis on "should."
Reward
Blue Shield or Rocket Launcher, Money and XP