Bloodletter

Fire Aura. At the start of each of the Bloodletter’s turns, each creature within 5 feet of it takes 7 (2d6) fire damage, and flammable objects in the aura that aren’t being worn or carried ignite. A creature that touches the Bloodletter or hits it with a melee attack while within 5 feet of it takes 7 (2d6) fire damage.

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

Magic Weapons. The Bloodletter's weapon attacks are magical.

Multiattack. The Bloodletter makes two attacks with its longsword.

Longsword. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 15 (2d8 + 5) slashing damage plus 10 2d8) necrotic damage. If the Bloodletter scores a critical hit, it rolls damage dice three times, instead of twice.

Warp Step. The Bloodletter magically teleports, along with any equipment it is wearing or carrying, up to 120 feet to an unoccupied space it can see.