Blazing Herald

Burning Soul. After being in the presence of the aether-flame and living to tell the tale, the Blazing Herald has become a flame-touched and is able to cast fire based spells at no cost and cast fire based cantrips as a bonus action.

Spellcasting. The [monster name] is a 3-level spellcaster. Its spellcasting ability is wisdom (spell save DC 13, +2 to hit with spell attacks). The Blazing Herald has the following artificer spells prepared:
Cantrips (at will): Create Bonfire 1d8 fire damage, Control Flames 1d6 fire damage
1st level (3 slots): Firebolt 1d10 fire damage, Burning Hands DC 13 DEX saving throw on fail take 3d6 fire damage or half as much on a successful save

Dual Weapon Fighting. The Herald can wield and swing two weapons at once in one action.

Short Sword. Melee Weapon Attack: +3 to hit, reach 5 ft., 1 target. Hit: 4 (2d6 + 4) slashing damage. 

Hand Axe. Melee Weapon Attack: +3 to hit, reach 5 ft., 1 target. Hit: 4 (2d6 + 4) slashing damage. 

Opprotunity Attack. When a targets back is turned and so long as the target is in range, the Blazing Hareld can use an action against the target.