The Triadultus have only made contact once. Despite extreme reserve and secrecy in every other manner, their delegates arranged to meet in person at the First Contact Summit.
Most of what can be postulated about the Triadultus is gleaned from exhaustive analysis of the physiology and behaviour of the delegates. Notably they appear to be a colonial organism comprised of three distinct individual organisms. One organism comprises the base or "foot" of the body, and appears to be whole despite a physically intrusive interface with a lightweight synthetic trunk. The two other partners in the entity appear to be cut down to a head and a single arm each.
Communication at the summit was sparse and confused. The Triadultus, despite initially appearing confident, became disoriented with their surroundings and uncomfortable with the human delegates. Finely tuned questions and discussions-points from the Earth Plenipotentiary Peace Commission evidently disturbed the Triadultus representatives; revealing they were under the belief and experience that they physically resembled the homo sapiens they were meeting in every apparent measure. The summit was cut short. No followup communications with humanity have occurred since.