Abyssal weapon. All attacks by this monster are considered magical and do +1 physic damage (Not included in the attack).

Spellcasting. The Abyssal Guardian is a 1rst-level spellcaster. Its spellcasting ability is Charisma. The Abyssal Guardian has following Sorcerer spells prepared:
Cantrips (at will): Fire bolt, Control flames, Poison spray, Dancing lights. 
1st level (2 slots): Magic missile, Mage armor 

Multiattack. The Abyssal Guardian makes two Abyssal sword attacks.

Abyssal sword. Melee Weapon Attack: +3 to hit, reach 10 ft., 1 target. Hit: 9 (2d6 + 4) slashing damage damage. 

Sword throw. Ranged Weapon Attack: +2 to hit, range 10/60 ft., 3 targets. Hit: 7 (1d6 + 4) slashing damage.