Feedback for two of your monsters.
Scarred Warrior + Tilinikan
I had the BBEG graft the plant into the Scarred Warrior who was lashed constantly unless in battle. The occasional crit would add another plant to the defenses. The players had seen Scarred Warriors before (one of my favorites, a demon is making one from every commoner he captures. Players are finding a way to reverse the younger one's transformation) but one with four extra attacks and entangling powers was shocking. I may be doing more experiments with Scarred Warrior grafting.