Q: The noble families of Aundair are said to be particularly influenced by Thelanian manifest zones and/or ancient pacts with archfey. Is this something that tends to be visible or noticeable with *individual* nobles (in an "Oh, that guy walking down the street has [weird feyish eyes/a unique Thelanian familiar/etc.], he's probably an ir'So-and-so" kind of way), or is it purely an overall trend or a family-level impact (in a "the ir'So-and-sos have [lots of warlocks in the family/mystically fertile orchards on all their estates/etc.] thanks to their deal with [patron]" kind of way) that wouldn't help someone pick out an Aundairian noble from a non-noble warlock, a wealthy merchant who knows some magic, a Brelish noble wearing Aundairian fashion, or the like?
So there's a few factors here.
Part of this was addressed slightly in a different answer last month: "In my campaign, a lot of the fey interactions in Aundair are more on the level of 'Leave your old shoes out with a saucer of milk and the Cobbleknocker will make them better than ever' rather than granting warlock powers; there’s also family pacts that were made long ago and are fairly passive in their actions, along the lines of 'As long as a member of the Milroy family never allows a tool to grow rusty, the Mother of Invention will bless their forge' — if you don’t KNOW that the Milroys have this pact, it’s not like their diligent tool cleaning is obviously tied to a supernatural bargain."
This is true for nobles as well. Overall, Aundair is known more for its wizards than its warlocks. Powers along the level of Magic Initiate or Fey Touched are relatively common in pact families, but fully-powered warlocks represent an exceptional bond between the patron and the warlock; in families where warlock powers are part of the arrangement, it's usually a one-in-a-generation sort of arrangement rather than everyone-in-the-family. Likewise, it's not like the arrangements typically result in dramatic physical transformations like tieflings. The most common attribute would be that Aundairans look a little more "fey" than most humans... but this is also easily attributed to the fact that Aundair has a significant elf and Khoravar population, and people just see most Aundairians as having traces of elf blood.
So part of the point is that lots of Aundairians at all levels of life have some sort of casual bargain with fey that won't stand out. HOWEVER: while Aundairian nobles aren't tieflings and most aren't warlocks, that doesn't stop them from CHOOSING to advertise an archfey alliance. If the ir'Dannan line has an alliance with the Forge Maiden, they might work an anvil-in-a-heart design into their coat of arms, and ir'Dannans might wear a ruby anvil-and-heart brooch because they take pride in their connection. On the other hand, the ir'Lothans, who have an arrangement with the Second Son that causes their rivals to suffer ill fortune, may explicitly NOT advertise the relationship because it's a little shady; someone can track it with a History check, but they prefer not to draw attention to it.
So Aundairians may CHOOSE to advertise fey alliances, but for the most part these pacts don't have obvious physical attributes.
HOWEVER, one of the things I point out in Exploring Eberron is that cosmetic transmutation offers a wealth of options and that Aundairians, which the greatest access to casual magic, are the most likely to take advantage of this. So Aundairian nobles could have silver hair, or midnight hair with stars twinkling in it, or slightly luminescent violet eyes, or whatever you decide is currently in fashion; however, the point is that this would be voluntary cosmetic transmutation rather than a hereditary mutation like a tiefling.
But certainly, if you have a working class Brelish warlock next to an Aundairian noble warlock, the Aundairian COULD have silver skin and a beautiful brooch advertising their patron while the Brel has grease on their hands and hair. BUT that's not a requirement -- and while the BROOCH would indicate noble line, the silver skin is just the cool look this summer.
Though having said that: I could see an Aundairian noble line that chooses to affect a particular cosmetic transmutation; the ir'Varo family have affected silver hair since the time of Margana Lain. But it would be a custom rather than a mutation -- and it might have nothing to do with any fey pacts the family has.
Source: May 2024 Q&A