This is the object Thorns in the Geneforge Games. For the generic term, see Thorns.
Thorns are small, sharp objects coming in packs of six that can be loaded into a Thorn Baton and fired at different enemies. Thorns are organic; they are grown in bushes and can be harvested periodically from them. These objects are almost weightless; it takes much thorns in the first three Geneforge games to encumber a Shaper.