| Category | Systems |
| Alias | Highway of Creation, 4th Dimension |
| Super | Nawirrûs |
| Focus | Travel |
The Astral Sea is one of the four dimensions of Nawirrûs. It encompasses an area equal to the size of the Core Dimension, the one populated with stars and worlds. Since the Dawn Era, the Astral Sea has served as a conduit, funneling energy and matter from Chaos to regions in the Void where Creationists have constructed, and continue to construct, new worlds. Without access to this dimension, where travel can be remarkably faster than traversing the Void, they would have been unable to build beyond the Elemental Ring Worlds in the time they did.
The 4th Dimension, often referred to as the Highway of Creation, is strewn with the raw wreckage of Creation. It is a perilous landscape that requires the use of specially engineered vessels to traverse it safely.
The most optimal means of traversing the Astral Sea is through the utilization of psychic energy.
In the boundless expanse of the Astral Sea, trajectories weave a complex tapestry, with celestial bodies moving in myriad directions - some maintaining a steadfast course, while others drift aimlessly. Collisions are largely averted or mitigated by the sturdy bows of Astral Ships, or by traversing at a more leisurely pace. However, the drawback of slow travel lies in the sheer vastness of the surroundings, akin to the grandeur of Nawirrûs.