Yoru is by far the strongest blade in the world. It's a Saijo O Wazamono that has been forged black, making it stand above all other Saijo O Wazamono.
A mere O Wazamono (and not even black at that!) like Enma was able to:
Based on the above, I conclude that Enma is Kaido level.
Yoru is a black Saijo O Wazamono and thus far stronger than Enma. Given that Shanks and Kaido are roughly on par, I conclude that Yoru is far stronger than Shanks.
A mere O Wazamono (and not even black at that!) like Enma was able to:
- Nearly two shot Kaido
- It gave him his lone grievous scar
- Terrify Kaido so badly that he has to dodge an attack
- Overwhelm Kaido's Tatsumaki and badly cut him up when nerfed by two other swords
- Enma may later be responsible for giving Kaido a new scar/reopening his old one or even killing him.
Based on the above, I conclude that Enma is Kaido level.
Yoru is a black Saijo O Wazamono and thus far stronger than Enma. Given that Shanks and Kaido are roughly on par, I conclude that Yoru is far stronger than Shanks.