|16||5223 XP, 4 Eridium|
Begin the mission by removing the power core right by Lt. Davis and replacing it with the one that dropped off of Wilhelm. It turns out that it was a trap and the shields protecting Sanctuary has been lowered, letting Jack blast it with the space station. Meet up with Scooter in the center of the town, who says to cycle the ignition primers.
Just run up to the two of them and press the button, then wait around a few seconds until Roland yells for some help. Go to the hideout and you'll find him trapped underneath some debris. Pick up the five pieces of Eridium and deliver it to Lilith in the center of town. You'll be teleported out of the city, so sit back and watch the action. Leave the area via the nearby travel point, then go to Three Horns - Valley and find the entrance to The Fridge, turning in the mission at the button.