I play druid 53 lvl (character “Whine” on this account) using spriggan form and vines as main dps source. I took the “Huntersbane” passive and stack attunement for posion damage. each vine shot shout inflict 100(base)+40(nightshade passive on tree)+18(toxic reach passive in druid tree)+48x4=192 (attunement scaling on vines skill) % chance to inflict poison on hit. Totally that is 350% or 3 to 4 poison stacks per hit. Testings shows that vines apply 1-2 poisons. The attunement scaling that adds 4% posion chance to the skill is not applying.
The resulting dps is very low. The build is bricked.