Horrify with Malicious Trolls

Trolls have the potential to be some of the most disturbing monsters out there, yet are unfortunately the easiest monster to let sit as a never-ending bag of hit points. A monster whacking slog to end all monster whacking slogs. If we examine them a little closer, and look at how their unique abilities can be used to greater effect, then we can avoid that sloggy fate, and create monsters that horrify in new and terrible ways.