Butcher of the Maze

Keeper of the Maze. When a creature enters the Fidakov maze, the Butcher knows of the intruder's presence, though does not not it's exact location. 

Known Paths. The Butcher knows the layout of the maze by heart and is never lost within it. It also knows the quickest route to any location within the maze.

House Arrest. The Butcher cannot leave the maze or enter the center of the maze. 

Magic Resistance. The Butcher has advantage on saving throws against spells and magical effects. 

Magic Weapons. The Butcher's weapons count as magical for the purpose of overcoming damage resistance.

Slaughter. The Butcher scores a critical hit on a roll of 19 or 20. 

Multiattack. The Butcher makes 3 Cleaver attacks.

Cleaver. Melee Weapon Attack: +10 to hit, reach 5 ft., 1 target. Hit: 9 (1d10 + 3) Slashing damage and 7 (2d6) Necrotic damage. 

Dash (Recharge 6). The Butcher moves up to his movement speed. The Butcher can only dash using this feature. 

Labyrinth Ripple. The Butcher runs his 2 cleavers together to create s ripping sound that seems to come from the very walls of the maze. All creatures within the maze must make a DC 15 Wisdom saving throw or take 1d6 Psychic damage and become stunned for one turn. The Butcher also knows the exact location of every target who failed the saving throw.