Missile, Incendiary (Major)

You have a +2 bonus to attack rolls made with this enhanced wrist launcher ammunition, which deals 1d6 kinetic damage on a hit. This bonus is in addition to any bonuses granted by the weapon. Additionally, hit or miss, the missile then explodes, setting the ground beneath it in a 15 foot radius ablaze for 1 minute. When a creature enters the fire or starts its turn there it must make a DC 18 Dexterity saving throw. On a failed save, the creature takes 3d8 fire damage or half as much on a successful one. A construct makes this save with disadvantage.