The Trigates are massive structures built by the Precursors that act as gateways allowing for near-instantaneous transportation between different worlds. Of all the remnants found of the Precursors, the inhabitants of the planes consider Trigates to be their crowning achievement.
Trigates have played an incredibly important role in the history of the planes, ultimately influencing every being. While every world has its unique history, cultures, and ecosystems, upon becoming a planeswalking civilization, they become a part of a greater whole. If it wasn’t for the Trigates, the Planar Council wouldn’t exist, and many worlds wouldn’t be as successful as they are today. However, they also open up new possibilities of threats and disasters, which certainly make them a mixed blessing.
As planar cultures developed, many societies set their eyes on participating in the larger culture of the Planar Council, slowing down the exploration of their own worlds. To those looking for adventure, a change of pace, or an escape, there are plenty of opportunities to be found on every world. To those willing to travel and put up with the rigors involved in traversing a myriad of locales, the Trigates offer nearly infinite possibilities.
Trigates are incredibly large structures, taking up a large amount of space and are usually the tallest artificial structure on every world. Triangular, they stand 1025 feet (312.42m) from the base to the top, with the base having a width similar in length. They are made from an unknown metallic material, seemingly indestructible and unaffected by anything used on it. As they are very durable, the Trigates are all incredibly ancient. The outside area of the Trigate that faces away from the portal is a bright silver color that is highly reflective. The internal area where the portal is active, however, is a darker silver color.
Inside the Trigate lies the portal, a nearly transparent white shimmering field of energy. This portal is always active.
Placing one’s limbs through the portal has no effect, as the portal will only transport whole objects so that any object which has not fully entered the portal can be removed without trouble. The Trigate does not seem to send an object through until it has entirely passed through the portal, ensuring only complete objects are moved. In the event of larger objects containing smaller ones, such as vehicles used for transporting goods or people, the larger object itself counts as a single object of higher priority than its contents. Depending on which side of the portal is entered determines the exiting side on the other end. As both sides of the portal are usable, it can appear that two objects are “entering” each other, while they are, in fact, entering the portal at the same time. This has caused a lot of civilizations to determine a proper entry and exit side to minimize this effect.
The portals conserving momentum, so caution should be used when entering it to prevent accidents. An object sent through at a certain speed, such as a person running, will maintain the same speed when exiting on the other side. Because of this, it is also possible to fire physical projectiles through the portal and harm others on the other side. Projectiles that are more energetic are seemingly just absorbed by the Trigate. The portal can determine the difference between passive and active contact of nearby matter in order to prevent unwanted transportation. This process keeps things such as air and water, which naturally exert pressure on their surroundings, from passing through the Trigate while allowing people and anything deliberately sent through the gate to pass freely.
Though the civilizations lack any proper way to determine the exact age of the Trigates, they are undoubtedly the oldest things on many worlds. As Precursor ruins are exceptionally rare, the Trigates are the primary reliable source of information regarding the Precursors.
An interesting note that raises questions in many scholars is the fact that the worlds the Trigates have been built on change with time, but the Trigates always remain upright, fully functional, and on the surface of these planes. There are many theories on this, but none of them are accepted as the truth.