Wildfire Ammunition (Patreon)

Weapon (an arrow or bolt), rare

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. A creature takes 4d8 fire damage, plus an extra 2d8 fire damage for every round the ammunition remained in its pocket dimension, on a failed save, or half as much damage on a successful one.

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.

An unchecked flame can burn kingdoms to the ground.