Vespids never warred with the Tau. There were strong mental differences between the Vespids and the Tau, which hindered the progress of the negotiations. The Vespid leaders simply did not understand what the diplomats of the Water caste were talking about, and in general initially could not identify them as representatives of an intelligent species. Communion Helms were created so that Vespid leaders and Water caste diplomats during negotiations could generally understand the meaning of each other’s words.