The increase ratio of sword-rubbing stone grade is *0.7, and the upper and lower error is not more than 0.03.
That is to say, level 6 sword rubbing stone increases the damage rate by about 4%.
The ninth grade is around 6%
To put it more simply, the 9-level sword rubbing stone is probably the effect of 3-level physical repair.
Moreover, wearing water attribute can increase the effect of 1% (this 1% can be ignored and basically useless).
Wear two wiping swords with Shi Shui attribute, and your own damage will increase by more than 10%.
In other words, 2000 damage +20 damage = 2000+(40 of 2000) = 2800 damage.
Then wear two level 9 sword swabs = 2800+(6% of 2800) = 2800+168 = 2968.
The damage of rubbing the sword stone belongs to the hidden attribute as well as the damage of repairing things. Only when the effect is displayed in the battle can it not be displayed in the character properties.
And the damage increase rate is calculated as above.
2000+(40 of 2000) = 2800 damage.
2800+(6% of 2800) = 2800+168 = 2968 damage.
Take the effect of repairing things into account first, and add the effect of rubbing the sword stone.
If the damage is 25 2000.
That is 2000+(50 in 2000) = 2000+1000 = 3000 damage.
Adding 6% sword stone is 3000+(6% of 3000) = 3000+180 = 3180 damage.
Another note. In addition to increasing damage, physical repair can also add 2 drops of blood per level.
Because considering that other people have physical resistance, they lose 2 drops of blood after removing the increased defense, so rubbing the sword stone only increases the damage and does not increase the effect of additional attacks.