>>96483729
Elves have very long lifespans and generations, meaning that an "aristocracy" among the Elves would be very different to a human one since the turnover rate of the ruling class takes radically longer.

Since an Elvish noble can't really expect his father to die any time soon, stewarding the inheritance is probably nott seen as a high priority for them, rather the scions of Elvish nobility have to go and pursue something for themselves where there is still unclaimed space. The Elvish socieial model is thus actually optimized for producing adventurers. Like the Normans immediately before the Crusades, they have large numbers (perhaps even multiple generations still "young" concurrently) who have basically no prospects at home.

So one could imagine that they are biting at the bit for an excuse to conquer something, so many of them become involved with the Church, or with other countries' politics in the hopes of being given lands in the conquered region. A Crusade might not interest them religiously (or it might, desperate young men find their faith all the time!) they would show up anyway and shout Deus Vult louder than anyone if it meant they got to carve off a slice of the Holy Land.

Of course, once the Elves actually take something, then you have a problem, because the process then begins anew, those Elves live for hundreds of years, meaning you can't rely on them assimilating into whatever culture they've conquered, and tons more young Elves who couldn't get in on the war at first will flood in to try and finangle their way into a subordinate position under the new rulers. And inevitably, when everything is parceled out, they're going to start looking around for more things to conquer. Elvish society likely moves in pulses as 2-3 generations build up without prospects and then explode outwards to try and seize more ground. This is almost certainly a phenomenon their neighbors are aware of and resent/fear.