The Faendryl are a greedy lot, and quite snobby.
Their morals (morals?)
are quite questionable, and they will take any means necessary to achieve
their goals, no matter the cost. They're power-hungry, they scheme. Where
the Dhe'nar look to better their race by following the Way in order to
rise, as a race, to a status above the Arkati, the Faendryl have no such
lofty and even noble goals. They want power in the here and now, in this
world, and will do whatever they need to to get it.
This isn't to say that the Dhe'nar are all peaches and cream.
A Dhe'nar
will just as happily see you dead as a Faendryl would. But where the
Dhe'nar is more likely to slit your throat or stuff a bolt spell down your
neck, the Faendryl is more likely to look up from his book, stick his nose
in the air, sniff, blast you, and go back to his reading. So where the
Dhe'nar are arrogant, the Faendryl are snobbish.
If a Dhe'nar invites you in for a drink, you're likely to be drinking blood
wine from crystal glasses. If a Faendryl invites you in for a drink, it's
tea served from fine bone china. See the difference? Another way of saying
it is that Faendryl are politicians. The Dhe'nar don't care...build your
governments and your power structures. When we're looking down from above
being served by the Arkati, we'll see whose work got them further. But the
Dhe'nar are some of the people that split off when the Elven Houses formed
and the Faendryl didn't, and they believe in that political structure.