Brimstone Guardian MK I

Bunker Breaker. Creatures with less than 10ft of stone, wood, metal, or other similar material between them and the brimstone guardian do not benefit from any from of cover. 

Legendary Resistance (2/Day). If the brimstone guardian fails a saving throw, it can choose to succeed instead.

Self-Destruct. Upon dropping to 0 hitpoints, or taking an action to self-destruct, the brimstone guardian begins to explode. At the start of the brimstone guardian's next turn, every creature within 100ft must make a DC 19 Dexterity saving throw, or take 35 (14d4) fire damage. On a successful saving throw, they take half damage. 

Unusual Nature. The brimstone guardian doesn't require air, food, drink, or sleep. 

Barrage (Recharge 5-6). The brimstone guardian makes four missile attacks. 

Doomgaze. The brimstone guardian chooses a creature it can see within 120 ft, highlighting the target with a laser. At the start of the brimstone guardian's next turn, Dexterity Saving Throw: DC 19, Everyone within 10ft of the creature targeted by the doomgaze. Failure: 52 (8d12) Radiant damage. Success: Half damage. 

Missile. Dexterity Saving Throw: DC 19, each creature within 10 feet of a point on a surface within 120 ft. Failure: 14 (4d6) piercing and 7 (2d6) fire damage. Success: Half damage. 

Teleport. The brimstone guardian and all creatures in contact with it teleport to an unoccupied space within 60 feet. 

Blink Protocol. Trigger: The brimstone guardian is targeted by an attack roll or subjected to a Dexterity saving throw. Response: The brimstone guardian uses the teleport action. 

Legendary Action Uses: 2. Immediately after another creature's turn, The brimstone guardian can expend a use to take one of the following actions. The brimstone guardian regains all expended uses at the start of each of its turns.

Blink (1 Actions). The brimstone guardian takes the teleport action. 

Burst (1 Action). The brimstone guardian makes a missile attack.