Grindstone

is one of the Attachments that can be bought from the Weaponsmith or obtained from the Redeem Machine with the relevant voucher.
== Effects ==
Each 's name may have White/Blue/Purple color, indicating that it increases a weapon's damage by 1/2/3/4 once attached.
* A of +1 damage can only appear for weapons in Group B below.
If the weapon has any secondary attack (like the ball of Baseball Bat), it is also affected.
== Compatible Weapons ==
 can be compatible with two groups of weapons:
* Group A:
** Weapons classified as Melee Weapons in the Forge Table (except Laser Swords and Lasso Gun).
** Bows and Crossbows (except Shuddering Thunder).
*** Bows have a special effect on s: if fully charged, the attachment will add x2 of its base damage. For example, a Purple , if fired with a fully charged Crystal Bow, will deal a total of 24 (48 critical) damage = 16 from the bow + (4x2) from the attachment. Another example is a White fired with a fully charged Slingshot, dealing a total of 9 (18 critical) damage = 5 from the slingshot + (2x2) from the attachment.
** Throwing weapons with melee attack: Crispy Bone, Jack and Mary, Javelin, Throwing Axe, Bamboo, Frost Spear, Heavy Hunter Axe, Giant Axe.
** Some Miscellaneous weapons: Crowbar, Iron Claw, Umbrella, Vine, Green Basin, Badminton Racket, Baseball Bat.
*** For Green Onions, Meat, Heavenly Sword and Carrot, both original form and variations (like Centennial Carrot) are included as well (except for the Grilled Heavenly Sword).
* Group B:
** Normal Throwing weapons: Ninja Stars, Paper Slip, Damaged Blade, Wrenches, Spike Knives, Boomerang, Ice Spikes, Ninja Stars Plus, Electric Ninja Stars, Green Essence, Molotov Cocktail, Hand Grenade, Windforce Ninja Stars.
** Buckler.
=== Rarity Limit ===
Certain weapons can only equip a of a given rarity or worse, but not better.
* Limit: White
** Hero Bow, Magic Bow
== Notes ==
* Red/Legendary and Magenta/Mythical weapons cannot have , or any other attachments.
* A from one weapon can only be compatible with other weapons if they are in the same group.
== Trivia ==
* Before Update 2.5.0, the could only affect certain secondary attacks, like the explosion damage of Explosive Crossbow and blast damage of Star Bow.
* At some point, the Nunchaku could only equip a of Blue rarity or lower. This has been changed in an unknown update, possibly Update 2.7.0.
* Before Update 2.8.0, when the Thunder Sword was still an Orange/Epic weapon, it could use a , but it couldn't be any rarity higher than White.
** This became a disaster since the change in 2.5.0, as the damage boost was added to every attack it can perform.
* After an unkown update, the way s work with Bows was changed. Making the s add x2 their damage if the bow is fully charged, as opposed to simply their listed damage, which is what happens to all other weapons.
** This stacks with the or conditions: a Purple typically has 4 damage, the "Weapon attack +100%, fire rate -50%" will double it to 8, and when the bow is fully charged, this bonus value is further increased to 16.
* Before Update 3.4.2, Vorpan cannot equip grindstone, despite being a melee weapon.
__NOEDITSECTION__
ru:Точильный камень
Category:Items
Category:Attachments