Cinder-Sprite

Fierna' s Mark: The sprite can communicate telepathically with its warlock master or its patron, Fierna, at a distance of up to 100 feet. If the sprite is within 30 feet of its master, the master can perceive through the sprite's senses using a bonus action instead of an action.

Fiendish Invisibility: The sprite can magically turn invisible as an action. Anything the sprite is wearing or carrying is invisible with it. While invisible, it leaves behind a faint trail of warm, sparkling soot that can be noticed with a passive Perception score of 13 or higher.

Ember Sight: The sprite can read the temperature of a creature's soul by looking into its eyes. As an action, the sprite touches a creature and senses its emotional state. It immediately learns if the creature's alignment is Good (warm), Evil (cold), or Neutral (tepid). If the creature fails a DC 13 Charisma saving throw, the sprite also learns one current, burning desire that the target is trying to hide.

Shared Boon: While the sprite is within 100 feet of its master, the master gains resistance to fire damage. Additionally, if the sprite takes damage that would reduce it to 0 hit points, its master can use a reaction to take that damage instead, causing the sprite to instantly vanish into a cloud of harmless smoke rather than dying.

Ashen Longbow: Ranged Weapon Attack: +6 to hit, range 40/160 ft., one target. Hit: 1 piercing damage plus 2 (1d4) fire damage.

The target must succeed on a DC 13 Constitution saving throw or become poisoned for 1 minute.

Cinder Burst: The sprite violently releases its inner hellfire in a 10-foot radius centered on itself. Each creature in that area must make a DC 13 Dexterity saving throw. On a failed save, a creature takes 7 (2d6) fire damage and is blinded.
 (Recharges after a short or long rest.)

Phlegethosian Dash: The sprite can take the Dash or Disengage action as a bonus action on each of its turns. When it uses this bonus action, it leaves behind a small puff of sulfurous black smoke in the space it just vacated.

Stoke The Flames: The sprite targets its master or one friendly creature it can see within 30 feet. The target's next weapon or spell attack that deals fire damage before the start of the sprite's next turn deals an additional 3 (1d6) fire damage.

Fiendish Retaliation: The attacking creature takes 3 (1d6) fire damage.

Evasive Sparks: When the sprite is targeted by a ranged weapon or spell attack that it can see, it can use its reaction to impose disadvantage on that attack roll by releasing a quick flash of blinding embers. If the attack misses, the sprite can immediately move up to 10 feet without provoking opportunity attacks.