The first iconic example to illustrate this concept is with Shusui when Zoro obtained it in thriller Bark..
Zoro tried to perform a standard 108 pound canon, which is 3 equally powered air slashes.. However,
the slash produced from Shusui was amplified and swallowed the other 2 slashes unbeknownst to the user
himself!.. Shusui enhanced at least 2x on its own Zoro's initial strike!.. Whether Shusui applies Haki to aerial
sword attacks is still in being debated, but it's unquestionable that Shusui Enhances Zoro's power output by
at least 2x..
Now Zoro has traded Shusui for Enma and he mastered Enma which increases his Haki power output by
at least 5x.. He imbue his own regular hardening on the Sword and it creates Black Lightning CoA that is
way more concentrated Haki than Hardening and even more potent than CoA Internal Destruction..
So..
Shusui - 2x
Enma - 5x
Next, we have Fujitora who has been recently confirmed to possess a Supreme Grade Blade.. Based on Shusui
and Enma enhancing abilities, it's only fair to think that Yakuza Kasen has enhancing powers as well.. And in
Fujitora's case Yakuza Kasen can enhance 10x his base area of effect Gravity Devil Fruit powers.. In Short Yakuza
Kasen gives control over the Island level rubbles which he would not be able to without his Supreme Blade there..
Yakuza Kasen - 10x
Same with Shanks, his Famed Blade Gryphon gives him 10x authority over his Red Lightning CoC..
Gryphon - 10x
Then the last one is Highly speculative but i think the reason why Whitebeard was so strong is because he wielded
Murakumogiri.. It gave him a 10x in raw Strenght at all times..
Whitebeard was still Stronger than Blackbeard without his Devil Fruit powers.. So i think Murakumogiri Enhances the user's
physical Strenght.. And if that's right, it means he destroyed Akainu without his 10x boost when he was already nerfed from
several angles.. Truly a Monster..
Murakumogiri - 10x
Zoro tried to perform a standard 108 pound canon, which is 3 equally powered air slashes.. However,
the slash produced from Shusui was amplified and swallowed the other 2 slashes unbeknownst to the user
himself!.. Shusui enhanced at least 2x on its own Zoro's initial strike!.. Whether Shusui applies Haki to aerial
sword attacks is still in being debated, but it's unquestionable that Shusui Enhances Zoro's power output by
at least 2x..
Now Zoro has traded Shusui for Enma and he mastered Enma which increases his Haki power output by
at least 5x.. He imbue his own regular hardening on the Sword and it creates Black Lightning CoA that is
way more concentrated Haki than Hardening and even more potent than CoA Internal Destruction..
So..
Shusui - 2x
Enma - 5x
Next, we have Fujitora who has been recently confirmed to possess a Supreme Grade Blade.. Based on Shusui
and Enma enhancing abilities, it's only fair to think that Yakuza Kasen has enhancing powers as well.. And in
Fujitora's case Yakuza Kasen can enhance 10x his base area of effect Gravity Devil Fruit powers.. In Short Yakuza
Kasen gives control over the Island level rubbles which he would not be able to without his Supreme Blade there..
Yakuza Kasen - 10x
Same with Shanks, his Famed Blade Gryphon gives him 10x authority over his Red Lightning CoC..
Gryphon - 10x
Then the last one is Highly speculative but i think the reason why Whitebeard was so strong is because he wielded
Murakumogiri.. It gave him a 10x in raw Strenght at all times..
Whitebeard was still Stronger than Blackbeard without his Devil Fruit powers.. So i think Murakumogiri Enhances the user's
physical Strenght.. And if that's right, it means he destroyed Akainu without his 10x boost when he was already nerfed from
several angles.. Truly a Monster..
Murakumogiri - 10x