I tested this (level 4, 2 druid, 2 dh)
(Combat): Spell Crit! Your Entangle has greater effect!
(Combat): You hit Syndicate Muscle for 33 points of negative damage.
My average negative damage per tick at 4 with straight starter gear is ~14, with crits in the 30s. As best I can tell, this is amplified by negative spell power.
I will be doing this.
Unfortunately its bugged:
You have multiple effects granting a Condition bonus to Condition Bool saying player is standing in magical plant effect that do not stack. ( Stand with Nature and Stand with Nature )
I haven't figured out if stand with nature is doing the ticks, or entangle, or if i am just casting 2 stand with natures and they dont overlap. If I had spike growth I could check.
There is no indicator of the 2d4 piercing damage. If it is doing 4d4 damage, it is still way over that with the average of ~14 negative damage.