Thanks
@jgsugden ! It's great to hear your experience using githyanki, as this will be my first time using them in anything more than a cameo role.
Sounds like you kept var'ith'n as more of a "behind the scenes" type, rather than an active adversary the PCs would engage with? That was my initial instinct, but maybe I was trying to artificially make them a "threat" in a stat block sense when that's not really their intended role.
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This campaign was about 20 years ago. I'd been running a PC in a game that was using a publiashed series of modules that had a big climax to the adventure in a war with Githyanki. After that completed, I did some looking into the Githyanki and read everything I could get my hands upon. Then, as was my norm, I simplified the situation as much as I could to make it more approachable to the players.
My Githyanki (and Githzerai) live in pocket planes that connect to the Astral Sea via portals. They're almost like islands in a 3 dimensional sea. In that campaign, the PCs did a hex crawl / dungeon delve that took them through ~10th level which culminated in them obtaining an artifact. The artifact had a sort of 'Doomsday Clock' associated with it, so they were seeking to destroy it. It was of ancient Githyanki make, and as is the norm for artifacts in my setting, most mundane magics could not reveal anything about it (artifacts are immune to all but the highest level magics). So, the PCs had to go search out information on the artifact fromGithyanki scholars.
To do this, they had to travel to the Astral Plane, navigate to my equivalent of Sigil (which is a giant city floating in as 'asteroid' in the Astral - that has thousands of gates to different places and planes built into the area - it is highly inspired by Babylon 5 and Hellraiser), negotiate with Githyanki for access to their territory, and then acquire their own Spelljammer style ship to travel there. They then passed into a pocket plane with a series of Githyanki settlements on (essentially) an asteroid belt. Within it, they went to a library, but to gain access to the knowledge they had to gather the favor of certain Gith, which involved a political storyline within the Githyanki (and Githzerai) cultures.
There was conflict, but the Githyanki were not just 'see and kill' enemies. They were a very lawful, very alien, and very well organized fascist culture. The PCs spent about 60(?) hours of RPG time within that pocket plane before they left it, and there was one short dungeon delve, one stealth assassination, and a few 'ship to ship' battles - but the majority of the time was spent outside combat trying to find their answers without being killed for trangressions against the Githyanki.
The var'ith'n were not, as far as I can recall, ever a direct antagonist. The PCs spent a bit of time dealing with a mission that took them to a place that was creating Spelljammer ships for the Githyanki, and in which they had to improve the efficiency of the workers without angering their masters. As a result, the PCs had to interact with a variety of people from different origins within the Githyanki society. Var'ith'n were key players in the situation.