"Twilight!" Spike called looking for his friend.
"Ugh, she's gone again, isn't she?" He muttered darkly as he started banging open doors.
He flung open a door and found the princess, his friends staring at Celestia now impaled on a chandelier that had fallen when he threw open the door.
"Uhhhhh...."
"Spike... you.. you just.. the chandelier.."
"I'm sorry!" Spike yelled. "Don't tell anyone! Please!"
"Shhh. Spike, it's okay. We just have to hide the body." Twilight said quickly teleporting the now deceased alicorn into the everfree forest.
"Wait, if the princesses are both dead, who's gonna rule equestria?"
"We are, of course." Twilight answered.
*Equestria then burns*
What... how.
Twilight's castle is made of rock, so maybe there was some obsidian in the chandelier? Since we've already established that Celestia's skin is basically impenetrable, and all.