What do you do with the root poison? I got it from the poison dude after the cow lady asked me to get it, and then she asked me to use it to kill the roots, but I can't figure out how to use the stuff.
I did have a glitch earlier in the questline where the crystals that appear after you talk to the husband just up and vanished after I fought one of the rock monsters (so I never did the resonate thing on them), would that break anything.