Slimy Demodand - CR 18 (Medium Fiend)

"It regarded me with baleful amusement, a bubbling chuckle rumbling through its armoured chest. 'Tasty mortal morsel, what do you think you are doing trying to stop the inevitable? Come here, and fulfill your destiny to die for my amusement'". 
I drew my blade, uttered a prayer to Solum, and charged. Within moments, I was sure the fiend's words may have truly been prophecy..."

 - From In Service to Our Lord, by Sir Adrus Keth'Solum