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Elves are physical beings but they live in a parallel 3D. They're a huge civilization stretching over many star systems and dimensions. The elven mainland is run by males who apply a structured breeding program to improve their race. They practice archery and have little interest in magic. They only keep very few women and 12 men marry the same woman and pass her around to maximize the use of the best genes. All other women are sent away and they will settle somewhere and establish a temple. These practice elven magic for a fee and also offer other "services". Because elves are resistant to racemixing all children will be elves no matter who the father is. Women born in temples are raised there, while the men are given a basic course in weaponsmithing and sent away. The men eventually return to the mainland. This way there is large group of elven women culturally disconnected from the main population, who still contribute by sending their sons back home.
These elves are RPH and want to ascend as a race, but because they lack control it ended up like this.

Dark elves or drow are a fringe group practicing LHP. They focus on their own path to divinity and form covens. They have tribal tattoos which represent their magic. Contrary to main population elves, the dark elves or drow, are immortals. They are not always born as elves either, and their souls are more likely to be picked up from other populations. They can recruit someone and transform them into an elf using a ritual. Or they can take a soul of a suitable person from hell, purify it using alchemy and then incarnate it as a dark elf. They want extremists who are used to breaking taboos and rules, as they see this as an essential attitude of the Left Hand Path. Drow are very hostile and your first interaction with them is likely to be them trying to kill you with a knife. Other elves don't shun them however, because they put their own race before others, and dark elves are still elves.

Forest elves are another fringe group, but harder to come by. They live deep in forest dimensions and rarely make themselves known. They seem at first glance to be like the mainland elves, but they strive for immortality like the drow.