Hell's Castle.

A structure will appear in the nether "Hell's Castle" In this structure there will be a devil, a three-headed Cerberus, and a wither skeletons. The devil will have a staff which will shoot fire; its reload lasts 0.75 seconds; it will set fire to whatever it hits. There will be Cerberus in the castle that are 1.5 blocks tall, 2.5 blocks long and 1.5 blocks wide he will have 16 health cells. The devil will be the size from the player, health cells will be 30, the devil's staff drops with a 5% chance.