Stowing and deploying your rats from a sack will multiply their health and damage to maximum allowed amount. They cannot die and they only know to kill. It has been agreed that the small fluffs of cuteness are illegal and anybody utilising them in warfare will be shot. (Multiplying stats is likely due to the way that the Dungeon Difficulty mod handles multiplying stats for different areas)

Issue can be fixed using the configs for Dungeon Difficulty, but they are not very clear on how to edit it as an end user.