One of the most important aspects of the Time of Ages campaign setting is the sentient magical artifact known as “The Bridge” or Jaua Ae-rielun, which means Heart of the World in the ancient language spoken only by the Elder Peoples of Rielun. This bridge was constructed by a tigé sorcerer named Igu Amuth-hal. The history of The Bridge can be read under the Prehistory of Rielun.
Once the Heart of the World became part of time, it became connected to every place in the known multiverse. This means it can appear anywhere, on any world, during history. It is connected to our Earth (or, at least, a fictional version of our Earth), as well as all the official D&D worlds that have a corresponding equivalent in the Spelljammer Gone Wild cosmology, which includes but isn’t limited to Eberron, Krynn, Oerth, Toril, etc.
Jaua Ae-rielun has the ability to appear on any of my Otherworlds or even the World of Kulan, although there isn’t a strong connection to the Mirrored Cosmology. As a metaplot idea, “The Bridge” allows me to bring anything I want into Time of Ages and my Steampunk Spelljammer universe, but I’m not inclined to bring in high technology or anything that would go against the Steampunk milieu.
However, since the bridge merged with time, it can take any form including that of any type of being both living and undead. Jaua Ae-rielun isn’t inclined to announce its presence, but when it does appear, it is usually to save a group or species facing peril, especially if they are the last of their kind. There are many peoples on Rielun who owe their existence to the Heart of the World and worship it as a god. The Bridge does not expect this praise but does not ignore it either.
Whatever form it takes is appropriate for the world or plane it appears on, so for a world where technology is more relevant, such as our own (or my alternate homebrewed version of Earth called AlterEarth), the bridge would appear much like the picture above. The Bridge can appear on land, at sea, under the sea, in space. There is usually a swirl of magic or energy around The Bridge but not always. Those that encounter it often have a sense of curiosity or wonderment come over them. There is an urge to cross and see where Fate takes them.
However, sometime the bridges appearance is more subtle or even a permanent fixture on a world where one of Rielun’s peoples originate from (if that would still exists). The crossing is almost always one way to Rielun, and it isn’t always active. Sometimes a portal key or alignment of stars is required for the crossing to become active. This is usually how it works on fantasy worlds in the SJGW cosmology such as the traditional D&D worlds that exist as Steampunk versions. Usually, such a bridge is subtle or even well used during daily life and isn’t seen as anything other than a wooden bridge crossing a stream or a stone edifice crossing a raging river.
Jaua Ae-rielun is a mysterious being and its intent is nearly impossible to fathom even for those that have studied its existence all their lives. The various peoples of Rielun respect the Heart of the World, at the very least, while those from other worlds that learn of its existence tend to think of it as a myth told by Rieluns. Those that have seen its powerful abilities often fear it and there are many sphere where its appearance portends doom for the sphere. Followers of the gods of the Steampunk Spelljammer cosmology consider The Bridge to be either a thief that steals from other worlds or a powerful overdeity of Rielunspace to be respected (or feared).