Wildfire Arrow

This ammunition smolders while you hold it, sparking softly with simmering embers. When you use this arrow or bolt to make a ranged weapon attack, it vanishes in a scattering of sparks immediately after it's fired: disappearing into a special extradimensional space without hitting a target. The ammunition's flames burn hotter the longer it remains in this space and can stay there for up to 3 rounds. You can use a bonus action on your turn to speak the ammunition's command word and choose a point you can see within 120 feet of where you fired it from. When you do, the arrow or bolt reappears directly above the point and explodes, creating a 20-foot-radius, 40-foot-high cylinder of searing flames centered on that point. Each creature in the area must make a DC 15 Dexterity saving throw. On a failed save, a creature takes 4d8 fire damage, plus an extra 2d8 fire damage for every round the ammunition remained in its pocket dimension. On a successful save, a creature takes half as much damage. If the ammunition remains in its extradimensional space for the full duration without its command word being spoken, it reappears and explodes above a random point within 120 feet of where it was fired. An arrow or bolt is destroyed when it explodes in this way.