I'll repost here what I sent you. I was actually working on a writeup for just that concern. Here is the quick version (I plan to clean it up a bit still)
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Wood and water Elves generally wander the lands outside the kingdoms, although they can sometimes be found crossing the borders. They are prime targets for slaves as they are beautiful, skilful, intelligent, and useable by Vaskaan. The wilderness is not a safe place for anyone though. The Elf cities are the only real safe haven the Elves have.
Although not close friends, all three tribes of Elves are friendly with each other and will try to help out each other when danger is around.
It is possible for Elves and humans to communicate without difficulty, although Elves also speak their own language. Because of this, there are many stories of people who got lost in The Great Green and befriended an Elf who eventually helped them find their way home. The light Elves even helped the Vaskaan people at one point during the wars which lead to their current peace treaty.
In a sense, the Elves are masters of the largest kingdom: the non-kingdom between the three; however, there are the constant dangers that come from being in the wilds (wild animals, trolls, undead, hippogryphs, the occasional dragon, etc.)
Half-Elves are very rare but not totally unknown. Some may try to hide their Elf heritage and make their way in the kingdoms, or they can live lives as partial pariahs among the Elves. Vaskaan and Light Elves are the most tolerant of half-Elves, again, because of the treaty; however, most people will still likely distrust the person if they find out about the mixed heritage.
I never really intended nymphs to be a playable race, but any adventurer caught out in the wilderness for an extended period would very likely see more than a few. And any Elf characters would likely meet more than a few as they are more than happy to socialize with wandering Elves
Nymphs are closely associated with Elves. Elves revere nature and Nymphs embody nature. That is not to say Elves worship these nature spirits, just the two share common goals and ideals. The Elves try to protect the natural world that the Nymphs live in. For this reason, Nymphs often dwell near places popular to Elves and will often help the Elves as much as they can. It is not uncommon for a Nymph to jump to an Elfâs aid if they are cornered, or help hide an Elf who is on the run from Human hunters.
It is said that in and around the Elf cities, Nymphs can be found in abundance. They play with Elves and help defend the cities from outsiders. The most common way of doing this is by leading the humans away into the forest until they are totally lost, at which point the Nymph slips away.
If caught and removed from their home for too long, less than a day, the Nymph will wither and die.
Nymphs speak broken Human at best, but they can speak Elf fluently given their close relationship. These are learned skills though as naturally Nymphs do not speak in a way we would recognize as they talk to each other in the language of earth and trees and water.
Nymphs can become cursed if the land they inhabit is cursed. This often drives the Nymph mad and can make them a dangerous foe to all living things. Nymphs are extremely powerful, less so the further removed from their home location.