The supports that crumbled were near the entrance towards the tomb, which then in turn destabilized some of the area just outside their battleground. Yerbol had wanted to tell her they could pull themselves out of this together if they focused their powers, but when the idea came to his mind, it was too late. The once cavernous ceiling buckled a few more times before giving way, chunks of stone and mounds of dirt collapsing in front of the entrance, effectively sealing them in. He would think of a way out in a moment, but first he had to check to see if...

He groaned, running a hand over his face. Lysa's once visible body had been buried underneath the cave in. He could expend all of his energy attempting to secure her body, but with a dangerous attacker in the room, he would need every ounce of strength to make it out intact. 
"I'll do all I can to make sure your memory lives on, sister." He whispered faintly, his ears picking up on the Sith's bitter verbal jab. 
"Is that really all you're worried about?" He cast her a glare, continuing:
"You DO understand that we're going to have to actually, you know, work together to get out of here, right? That you've got no shot of making it to the surface on your own? But no, of course you wouldn't think about teamwork. You're a Sith. Power to the individual and all that-" His condemnation of the Sith was interrupted by spotting a hallway that extended away from the tomb. That was a wall before...right? 
"Is that...that a trick you're playing on me?" Yerbol cautiously approached the new-found passage, placing a foot over the threshold without any consequences. 
"During our fight, this must have receded. Is this what Lysa was looking for? What you were looking for?" The line of questioning was more of him thinking aloud, knowing that the Sith wouldn't reveal anything to him...or would her natural curiosity get the better of her? Either way, he proceeded forward down the passageway. His broad shoulders grazed the hallway as he strode ahead, extending a hand and channeling the Force to provide a blueish light to guide him. 

A couple of minutes later, he emerged into a circular room lined with shelves containing old scrolls and parchments that were spilling over their appointed locations. In the center of the room was a pedestal that held a sphere pulsing with red light. As he drew closer to the sphere, the light began to pulse quicker until he was within a couple of feet. The pulsing stopped, but the sphere itself unfolded, shooting beams of light up on the ceiling. He looked up, raising his illuminated hand. There were dots sets against the ceiling along with numbers next to some of the dots in parenthesis. After closer examination, the dots seemed to be in a pattern...
"All leading right..."