Spellcasting.

The flamewrath is a 7th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 14, +6 to hit with spell attacks). It knows the following sorcerer spells:

Cantrips (at will): control flames, fire bolt, friends, light, minor illusion
1st level (4 slots): burning hands, color spray, mage armor
2nd level (3 slots): scorching ray, suggestion
3rd level (3 slots): fireball, hypnotic pattern
4th level (1 slot): fire shield (see Wreathed in Flame)

Wreathed in Flame.

For the flamewrath, the warm version of the fire shield spell has a duration of "until dispelled." The fire shield burns for 10 minutes after the flamewrath dies, consuming its body.

Actions

Dagger.

Melee or Ranged Weapon Attack: +5 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 4 (1d4 + 2) piercing damage.

Flamewrath