Edge

The outside boundary of a shard, it has a vital role in the safety of it's residents and how it interacts with the greater Nebula. Edges can vary as much as the Shards they belong to. To an adventurous traveler, crossing the boundaries of an edge may be one of the trickiest parts of their Journey across the Nebula.   The nature edges can be explained using the methodology of Fundaments Theory. Several different factors can bring distinction between edge systems. Below are listed examples of some common edge systems that you can find in your adventures across the Nebula.  

Arrangement

  Flat Earth Model- Hexes are arranged in a flat plane. Earth below and sky above is exposed to the Nebula if the edges are weak enough. The most common arrangement edges form, if viewed from incredibly distance with great magic the realms appear to be floating continents drifting in the space. Edges in this world are hard divisionary lines that separate the shard from the aether.   Circular Nucleation- Hexes are arranged in such a way that the edges will supernaturally loop on eachother. The more isolated realms may not even be aware of the cosmology their multiverse abides by as the horizon is visibly curved and the world does not have a definitive "end". Under this set of fundaments one can travel in a straight line indefinately across a shard, becoming returning to the opposite end of the realm in one continuous experience. Indeed there is little evidence of edges or boundaries at all, causing confusion to unaware travelers who find breaches in them.  A traveler native to this realm may be under the mistaken assumption that their world is a sphere or some variety of oblate spheroid even- but astrologers concur that this is some eccentric characteristic of the shard's fundaments to retain some inscrutable narrative.   Tense Nucleation- Hexes are arranged in a tight fashion in such a way that the edges will physically curl onto eachother forming a broken prism with the surfaces of the hex inside of it. Such an arrangement is uncommon and it forms an inverted world where the horizon does not exist and every outside point is visible to every other outside point like the inside of a large bulb. Such panopticons are common in void shards and can be extraplanar prisons for terrible creatures.  

Permeability

  Perforated Edges- Boundaries are slight and the laws of the fundaments weaken and taper as one approaches the edges of a shard. Blending almost seamlessly with the aether around it, hapless wanderers can sometimes stumble into shards like this without fully being aware of it.   Fortified Edges- Boundaries are artificially enhanced through shardshaping. Difficult to breach, these edges do not spill or influence the aether and often form great physical obstacles in their respective shards. Great walls of force, mountains and solid stone walls are all known materials edges can form to block tresspassers. Great wizards and druids have been known to use shardshaping to create realms such as this to quarantine dangerous monsters or diseases.   Edge Breaches- Gates, or holes can be made upon edges of more solid boundaries allowing exclusive egress to those privvy to them. Whether it is made deliberately as a maintainence entrance or as a means to force entry sometimes these breaches can occur far from the edges in secluded vales, glades and ruins.