Weapon Sundering
You can attempt to damage, and potentially destroy, a weapon held by a hostile creature. On your turn, you can take the Sundering action to damage an enemy’s weapon. Make a melee weapon attack roll with disadvantage against the target’s Armor Class as normal. If the attack hits, roll weapon damage and instead apply the damage to one weapon being wielded by your target.
Weapon Hit Dice and Hit Points
A weapon’s hit points are presented both as Hit Dice and hit points. A weapon has a number of Hit Dice equal to twice its damage dice. For instance, a longsword has a 1d8 damage die, so it has 2 Hit Dice, which are d8s. A weapon’s hit points are determined by taking the average of its hit dice. For instance, a longsword has 2 Hit Dice, which are d8s, so it has 9 hit points on average, as shown in the Hit Dice Average table below.
Hit Dice Average
| Hit Die | Average Hit Points per Hit Die |
|---|---|
| d4 | 2.5 |
| d6 | 3.5 |
| d8 | 4.5 |
| d10 | 5.5 |
| d12 | 6.5 |
At the GM’s discretion, some weapons might be resistant, immune, or even vulnerable to certain types of damage (such as psychic and poison). Magical weapons have resistance, or even immunity, to damage from nonmagical weapons.
Repairing Damaged / Broken Weapons
A weapon is destroyed when it drops to 0 hit points. As long as a weapon has 1 or more hit points remaining, a character can attempt to perform minor repairs by spending one or more of the weapon’s Hit Dice at the end of a short rest, up to the weapon’s maximum number of Hit Dice. To restore hit dice, the player must first make a check with a relevant tool for its weapon type (Smith's Tools for metal weapons, Tin-ker's Tools for anything else, or any other Tool that might work).
If a weapon has at least 1 HP remaining, you can attempt to make minor repairs to it during a Short Rest. To attempt to restore HD, a character must make an Intelligence check. The DC is 8 + the amount of damage the weapon has taken. The player has advantage on the roll if they know the mending spell or are proficient with the appropriate artisan’s tools (smith's tools for metal weapons, tinker's tools for crossbows or similar weapons). On a failure, the Hit Die is expended and no hit points are restored. On a success, the player can spend the weapon’s Hit Dice to restore hit points. The player can decide to spend an additional Hit Die after each roll.
A weapon regains Hit Dice when serviced by a professional with the appropriate artisan’s tools, who can repair the weapon over a number of hours equal to the size of the weapon’s damage dice. For instance, a blaster rifle has a 1d8 damage die, so it would take 8 hours to repair. This service costs half the value of the weapon.