You tell your familiar to 'north'.
>> You strain a bit and barely manage to fit through the door.
>> The Underdark
>>
>>
>> >> A clawed paw swipes at you from behind!
>> The displacer beast steps out of the shadows.
>> The displacer beast's claw MASSACRES you!
>> That really did HURT!
>> The displacer beast's claw DISMEMBERS you!
>> That really did HURT!
>> You sure are BLEEDING!
>> The displacer beast's claw DISMEMBERS you!
>> You have been KILLED!!

Your familiar's death === OBLITERATES === you!
That really did HURT!