Monsters are creatures that the Castle Master from Tecmo's Deception: Invitation to Darkness can summon with Block Orbs to assist him. They are created by sacrificing intruders that he captures in the Castle of the Damned after Chapter 6 "The Old Magician". Monsters gain experience when they attack invaders and can level up into more powerful variants, but the player will not gain experience from invaders killed by monsters.
"Will bite and chew a human's flesh." A slow and relatively weak monster that's usually created first and is best used for wearing down enemies. Levels up into Ghoul and Dead King
"Fire flows from mouth to destroy his prey." The most powerful monster in the game with the only drawback being a high block orb cost and a lot of space to summon it. Levels into ArcDragon