Title, there doesn't seem to be a consensus. If you change form on sustain does it refresh the temp HP? As part of the line "When you transform into a form granted by a spell, you gain all the effects of the form you chose from a version of the spell heightened to darkened forest form's rank."
It seems like it's fairly bad if it doesn't refresh the HP. Compared to the other battle form focus spell in Animist that gives a free strike or Druid's wildshape that doesn't require sustaining. Sure you get to change damage type or movement type but IMO that's not really worth basically being slowed with no other benefit.
