Booming Herald

Thunderous adept. After study and discovery in the field of the thunderous clouds up above, the Booming Herald can cast cantrips that deal thunder damage as a bonus action and any spell 1st - 3rd level at no cost.

Spellcasting. The Booming Herald is a 5th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 14, +3 to hit with spell attacks). The Booming Herald has following [class name] spells prepared:
Cantrips (at will): Booming Blade 1d8 thunder damage when target moves 5 feet, Electric Arc 1d4+4 thunder damage
1st level (3 slots): Arcing Charge 1d8 thunder damage, Dazzling spark 2d6 thunder damage and target has disadvantage on all sight based saving throws until the end of the Heralds next turn 

3rd level (3 slots): Thundering step teleport any unoccupied space within 10 feet of the Booming Herald and anyone within 10 feet when the Herald teleports must make a DC 14 constitution saving throw and take 2d10 thunder damage and half as much on a successful throw

Action Name. Enter the description for your action.

Glaive. Melee Weapon Attack: +3 to hit, reach 5 ft., 1 target. Hit: # (1d10 + 3) slashing damage.