Lonely Samurai. enables Zephyr to counter with his bonus action when prepared.

Spellcasting. Zephyr is a 4th-level spellcaster. Zephyr has following spells prepared:
Cantrips (at will): Fire Bolt (5th level cantrip)
4th level (3 slots): Flame Blade 

Action Melee Attack.

Iai Slash: +4 to hit, reach 5 ft., 1 target.

Hit: 4d10 Slashing damage. 

Action Ranged Attack.

Fire Slash: +3 to hit, range 60 ft., 1 target.

Hit:  3d10  Fire damage.

Counter - if prepared, and Zephyr is attacked with a melee physical attack, can use an Action Attack as a bonus action.

Counter. When hit with a physical Melee attack, is able to use an Action Attack as a bonus action.

Zephyr has one legendary spell that he has 3 charges for.

Zephyr holds one hand on his chest, and utters the words "be my Shield, Erebus"

Armor of Erebus (uses 1 charge). Gains Physical immunity for 5 turns, and his armor starts radiating an aura with red and black miasma.