Commander Sanrei Izumi

Budokai. When battle begins, the exits are sealed by flames until either Sanrei defeats his enemies, or he is felled.

Spellcasting. Commander Sanrei Izume is a 1-level spellcaster. His spellcasting ability is [14] (spell save DC 13, +4 to hit with spell attacks). Commander Izumi has following [Evocation] spells prepared:
Cantrips (at will): [Green-Flame Blade], [Fire Bolt] 
1st level (2 slots): [Hellish Rebuke], [Burning Hands] 

Multi Attack. Commander Sanrei Izumi can attack 3 times wth Koko Gonmaru Enryu (Sealed).

Koko Gonmaru Enryu (Sealed). Melee Weapon Attack: +5 to hit, reach 5 ft., 1 target. Hit: 10 (1d10 + 4) [Slashing] damage. 

Koko Gonmaru Enryu (Released). Melee Weapon Attack: +5 to hit, reach 20 ft. 1 target. Hit: 8 (1d8 + 2). Stuns enemies hit at distance.

Koko Gonmaru Enryu (Ablaze). RangedWeapon Attack: +2 to hit, range 5/35 ft., 3 targets. Hit: 10 (1d10 + 4) [Fire] damage. Enemies hit by this attack are knocked prone.

Disengage: Monster can retreat from battle without suffering an attack of opportunity. 

Mage Slayer: When a creature within 5 feet of you casts a spell, you can use your reaction to make a melee weapon attack against that creature.

Parry Tactics. Once per round, Commander Sanrei Izumi can roll a dexterity saving through (DC: 15). If he succeeds, he can reduce damage from one melee attack by half.