"A what?" both women ask, as they guard the doorway in. The sounds of<em>something</em>big shaking the structure they're in can be heard, and rapidly drawing close to their location. "Whatever you're planning, better make it quick," Johanna said. "I think we have company."<br/><br/>A DC 20 Knowledge (engineering) check or a DC 30 Perception check determines where exactly to insert the inhibitor facet.