Vivisection  

The Location of the Rumbleroots is -978.71,+38.34,-281.29.

Be careful, there's many of Deadly Rumbleroots before the location.

Looks like this one changed last time they updated the game. Anyone have a loc on the rumbleroots?

There were only two spawn locations I could find for these, both were on the back side of Black Water Lake (roughly -500, -900)

This one was fairly easy. Follow the road from the bridge from the Commonlands, once you get to where the road vears to the left, near the grouping of bears and saplings, follow that road up. There are some soloable groups right before the next bridge and larger groups along the way. Didnt have to hunt them or wait, they just sort of rambled down the path right to me.