NANI?! How to get here?!

I am currently in "The Viper's Sanctum" and noticed this ledge. How do you get here? I looked all over the caves and am still stumped...

Help a samurai out?

I am currently in "The Viper's Sanctum" and noticed this ledge. How do you get here? I looked all over the caves and am still stumped...

Help a samurai out?