I have created a sub-race of Elves who were driven underground during the
human-elf wars pre-deismaar that are kinda a neat. You might like to do
something similar in your campaign.

I took the idea of Shadow Elves from Mystara and added my own special
abilities depending on the Clan. My players read this list so I won't go into
detail, but here are some rumors around Anuire:

1) The Shadowed ones (or deep elves) have lived underground for nearly 2000
years now and have apparently thrived in their new environment.

2) They used their powerful magic (much of which was lost to surface elves in
the post-Deismaar years) to modify, can we say warp?, themselves in order to
compete in this strange new environment. This has caused some real
psychological problems for some of them (alignment CN with some derangments to
a greater or lesser degree). Note--if any of you are familiar with the
Warhammer setting, I have taken all lot from their Dark Elf cultures, minus
the diety worship. The warping gives them a few extra abilities, and I've
developed the new Witch Elf Kit fighter-mage kit.

3) They had lived primarily in 4 large subterrainien cities that existed
somewhere betwen the real world and the shadow world, and thus could not be
easily found. (The Shadow Elves have since returned to Cerilia somewhere, but
still underground.)

4) They are attempting new diplomatic ties with the surface elves and many
humans fear, intend to continue the human-elf wars. Leaders fear the elves,
discovered marching by night in Tuornen, Avanil, Rhoubhe's Domain?!, and
Boeruine last year, may now be able to use underground tunnels and gain an
edge. It is said that a Half-Elven regent in the area may have been able to
prevent a successful negotiation with Rhoubhe Man-Slayer.

5) The Shadowed ones return have disturbed many Orog tribes deep within the
earth...

But after all the rumors came out over the course of a game year, the focus in
my campaign switched to Bechtur and has been so for a couple game years now.
::chuckle::

- -DKE