Complete the indicated task to unlock the corresponding ending.

Rescue Leanna from the Spider Pit in Chapter 8, purge Xana in Chapter 9, and take the Skull of Shadows and place it on the altar.
Rescue Leanna from the Spider Pit in Chapter 8, purge Xana in Chapter 9, and take the Skull of Shadows and throw it down the pit to your father.
Do not rescue Leanna from the Spider Pit or kill her, and take the Skull of Shadows and place it on the altar.
Do not rescue Leanna from the Spider Pit or kill her, and take the Skull of Shadows and throw it down the pit to your father.