BB Nahi, The Old Guard

Temporary Sight. If she suffers an attack to her head or a critical strike, her glasses are knocked off and she has disadvantage on all attacks.

Noxious Gas. At the end of each turn each player within 5 ft of her must make a Constitution Saving throw (DC 14), if failed they suffer 1d6 poison damage. 

Mage Slayer Knight. When a creature within 5 feet of her casts a spell, you can use your reaction to make a melee weapon attack against that creature. When she damages a creature that is concentrating on a spell, that creature has disadvantage on the saving throw it makes to maintain its concentration. She has advantage on saving throws against spells cast by creatures within 15 feet of her that she can see.

Multiattack. BB Nahi, The Old Guard makes three strikes, two with her cane weapon and one melee attack.

Big Granny Cane. Cane Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 11 (1d10 + 5) bludgeoning damage plus it must make a Strength saving throw (DC 14). On a failed save, you pull the target up to 5 feet toward you.

Yoke up. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 11 (1d10 + 5) bludgeoning damage plus it must make a Strength saving throw (DC 14). On a failed save, the target is grappled.

My Good Knee. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) bludgeoning damage plus it must make a Strength saving throw (DC 14). On a failed save, you push the target up to 10 feet away from you.

Cane Range. If a creature moves within 10 ft of BB Nahi, The Old Guard she makes one Cane Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 9 (1d8 +5) bludgeoning damage.