A long game

[After carefully examining and understanding its effects, you could not help silently marveling that this passive skill truly lived up to its [SR] rarity.]

[This was by no means merely a single enhancement to your physical strength. What truly made it terrifying was that it could raise the limits of both the user and their weapon at the same time.]

[In an actual fight to the death, an increase in strength and an improvement in weapon performance were never simply additive, but multiplicative.]

[Even an ordinary, standard-issue katana, so long as you held it, would undergo a qualitative leap in its cursed energy conductivity, material toughness, and cutting sharpness, unleashing terrifying killing power utterly unlike its normal state.]

[Moreover, given your consistently cautious yet ruthless fighting style, unless you faced someone far too weak, or the fight had only been a spar from the outset with no intention of deciding life and death, your default was to take it seriously and use a cursed tool.]

[This meant that whenever you entered a true combat state, this [SR]-rank dual bonus could practically be maintained as a matter of course.]

[If other factors such as armor-piercing efficiency, weapon durability, and cursed energy consumption in battle were also taken into account, the overall boost it could offer you in actual combat absolutely far exceeded the combined benefit of 15% + 15% = 30% on paper.]