I was trying to find a counter to lightening main passive Root of Warriors, and i heard from my friend that Mifune mystery is one of them.
According to his mystery description, it should disperse all buffs on the entire enemy team. But when i tried with my group mate in a test match, my mate's team still got immunity after taking my Mifune's mystery.
I tried with Kakuzu who's an other ninja with buff dispersion on mystery, but same result.
Is it a bug or Root of Warriors belongs to an other category than you called buff? If it is, plz fix it asap.