Before the Gates
It's believed that the ancient Hysilens' may have used Dimension Magic in an age prior to the gates, but even this is hard to say - the relation between the jumpgates and Dimension Magic suggest something of a link, but would imply that the Hysilens had a magical bloodline for Dimension Magic, making them the only species with such a thing.
There are many holes with the theory in the eyes of many - as it was believed that the Hysilens' possess race-wide
Fire Magic and
Summoning Magic bloodlines, and to also possess a Dimension Magic bloodline would potentially make them the only race to have triple or greater bloodlines. It's of course, also possible that the fox-folk had other methods to learn the magic types.
Early History
As a result of this, there
is no history of Dimension Magic prior to the
Shard Ritual, as it was impossible to possess naturally in a bloodline. Following the development of the Shard Ritual, the first discovery of Dimension Magic led to a sharp uptake in studies of the practice as those with a great deal of wealth picked it up.
Modern History
Few places are more synonymous with Dimension Magic than the Aurelian Empire - a rarity in the cluster for having a general, extreme preference for magic - it was still secondary to their technology, but in a more complementary fashion. The Aurelians had much of the cluster's initial supply of Dimension Shards, and so it was them that led the discovery of new uses for the magic.
All in all though, dimension magic is still in its infancy within the cluster, as it has yet to really mature.
Aldrin History
The story of Dimension Magic on Aldrin is fairly similar to that of Dimension Magic in the cluster, only more explicably tied to the Drakona Empire and other regional powers of the parts of the world it was found in. Owing to the nature of Aldrin, the techniques of Dimension Magic have been studied for much longer than in the cluster, but being as it and the shards trace their origins back to the Great Demonic War on Aldrin - far before the shards surfaced in the cluster itself.
In many ways, the world of Aldrin has the most extensive network of dimension magic casters around, with the famous Conclave of the Eight being a collection of 8 master spellcasters providing Teleportation Nexuses between major cities in the regions they reside in.
Dimension Shards
Natural proficiency in dimension magic is unheard of in the cluster and Aldrin; at best,
maybe the Hysilens' knew of it naturally, but nobody knows for sure. All of those with a talent for the craft learned that talent through Dimension Shards, and these shards are - as a result - among the most coveted of all Crysium Shards.
They're so coveted, in fact, that even on Aldrin general knowledge on where the dimension shards can be found is a precious matter indeed; it's believed that the Aurelian Empire fiercely controls the largest supply of the shards in the cluster, hoarding them for their own internal use, which tracks with their frequent use of the magic.
On Aldrin, the shards are purported to be more plentiful in the new world as a result of the arcane disasters that took place there, but in the old world and in Subterra, it's extremely rare, with the only known location being The Priory in Khalorn, and Votura in Drakona.