Of Gerunds...

The average gerund has 1d4 hit dice. They provide no treasure and little xp when destroyed. They are tricksy, however, and often travel in large packs. A nuisance of gerunds may cause trouble for the unwary. At a guess, they have a THAC0 of 10. Once a nuisance has settled into an area, they may form expansive warrens that will be difficult to remove. They are best destroyed and recycled for morphemes.