A Trove of Monster Options From the introduction: With Fifth Edition, monsters underwent simplification and streamlining to make combat encounters faster, smoother, and more enjoyable. Although monsters in the current edition work beautifully, there are times when I miss some of the monster powers and capabilities offered in the previous edition. This book, the Monster Arsenal, draws inspiration from those Fourth Edition monster powers. User summary: A collection of powers and modifications for 5th Edition standard monsters.