Sounds unimportant.
Well then stop listening to Nurahk :P
By the time he made some serious appearance in Cabal, the war was already over (due to Auran's departure and what follows, everyone being bored with Cabal) so nothing important happened afterwards.
But before that, Cabal made a huge impact on the community. At that time the secret societies included Shadowhand, Seperot with his merry bunch and Cabal, which actually wasn't a secret society. For example consider the following: Before Cabal came, espionage was hardly (or non) existant in Planeshift. After it made its appearance, this field of player activity went to its peak. It's fairly safe to assume about half of Cabal members were actually spies from other guilds. Through espionage Shadowhand met its demise. Even today you have to be careful about spies. This part of Planeshift "culture" didn't come out of nowhere. It came from war with Cabal.
You cannot really say it wasn't important. I dare to say Cabal (or more correctly Auran) was a much stronger force than whatever secret societies you came across ingame.
Additionally Cabal induced many power shifts within Yliakum. Those include:
- Case-fire between Dark Empire and Defenders, due to having common enemy.
- Dark Empire growing in power after Aelya took advantage of the case-fire.
- Defenders (although one of the strongest guilds before the war) slowly turning unimportant after I switched sides to the DE (see point two).
- Alliance between myself and Seperot broken.
- Rise of espionage: Destruction of Shadowhand.
- Seperot's rise to power.
- Fall of Mirth (community's disgrace).
All the forces mentioned above had a strong political presence within Yliakum.
Notice how those which I said to grow strong are still around, while those which turned weak are no longer part of Planeshift.