Putrid Eidolon's entangle occasionally reports causing 0 damage. Not sure if this is due to rune-shell like shields, but from what I can tell, it's not.
Also, entangle damages Ascendant, but does not root. Not sure if this is intended, and cannot remember if it works (/the same way) on grim hag.
As in they won't be rooted? Because I'll see damage #'s pop up in the fog of war... but I can't remember whether or not they're rooted, because I never make it within the root duration.