When you finish a Long Rest, you can create a number of pieces of ammunition up to twice your Craftsman level. Choose the ammunition's type (such as Arrows, Bolts, or Bullets) and which of the following benefits each piece of ammunition has. Unused ammunition degrades and can no longer be used when you finish a Long Rest.
Armor-Piercing
If you make an attack using this ammunition against a creature or object with an AC of 17 or higher, the attack roll has Advantage.
Dragon's Breath
This ammunition deals Fire damage instead of its normal damage type. A creature or flammable object hit by this ammunition starts Burning.
Drilling
Whenever this object hits a Large or smaller creature, fragments of it penetrate and continue in a 15-foot-long, 5-foot-wide Line. The first creature in that area takes damage equal to the ability modifier used to make the attack roll. This damage is the same type dealt by the weapon.
Flechette
When you make an attack using this ammunition, the attack is replaced with a hail of projectiles. Choose a target within the weapon's range to make a Dexterity saving throw (DC 8 plus the ability modifier used to make the attack roll and your Proficiency Bonus). On a failed save, the creature takes the weapon's damage, or half as much damage on a successful roll.