Flashfire Spear
Rare Weapon (Spear), Range 60/180, Thrown, Versatile, Requires Attunement. 

•  Deals extra 1d6 fire damage to any target it hits.
•  Flashfire.  After hitting a creature with a ranged attack with this weapon, you can use your reaction to make the spear explode in a flash of smoke and fire, forcing the target and all creatures within 5 feet of them to make a DC 14 Dexterity saving throw, taking 1d6 fire damage on a failure.
  After using this feature, you can either teleport within 5 feet of the target with the spear in hand, or teleport the spear back to your hand.

Returning Flame. If you are within 300 feet of the Spear, you can use your bonus action to teleport it back to your hand. If it is further than 60 feet, you deal additional 1d6 fire damage on your next successful attack roll with this weapon until the end of your turn.