There are plenty of ways to fight against the Root of Warrior team, y'know.

The Wind Main's (and the Water main's) new mysteries now remove buffs like Root of Warrior from Lightning Mains, for example.

It's been a day since 2.0 came out. Try waiting a few days and experimenting around for counters before making a "nerf this" thread. To your credit, at least you're asking for a nerf of something that's in the meta, and not idk GNW Neji lol

I haven't tested it with Mifune's mystery, but I know for a fact that the Wind Main's new mystery erases Root of Warrior :D