Just for my own curiosity, this is from my own game system (54 Fantasy). Beyond it being for a different game, is this entry similar to what you would like to see in 5E? If not, what should be different?
ELF, DARK
Elves are peculiar creatures of the natural world. Dark elves are generally scheming and grasping creatures who have let their desires consume them.
Dark Elves are usually found in underground or treacherously overgrown areas of wilderness.
Dark Elf House Guard
Medium Humanoid (Darkness, Elf)
Str: 5♦ Dex: 5♠ Int: 5♥ Pre: 5♣
Mel: 2 Ran: 2 Mag: 3
Def: 2 (6♠S1) Res: 2 (7♣A3)
Resolve: 5♣ Wounds: 5
Vision: Lowlight Speed: Enhanced
Skills: Armor (Light) (R2) 4, Athletics (Run) (R2) 7, Deception (R2) 7, Endurance (R0) 5, Evade (R1) 3, Language (Common) (R1) 6, Language (Elvin) (R3) 8, Perception (Listen, Spot, Taste) (R1) 6, Persuasion (Intimidate) (R1) 6, Spellcraft (Arcane) (R1) 4, Stealth (R2) 7, Weapon (Blade) (R2) 4, Weapon (Crossbow) (R1) 3
Attack: Short sword A7♦/D6♦ (Crit: Ace) or Light crossbow A6♠/D5♠ (Crit: Ace; +draw card)
Heavy Strike (R1): Make a Short sword or Light crossbow attack. On a hit, deal 2 wounds + draw card for additional wound.
Defensive Stance (R2): Weapon (Blade) Diff 14, Scene; Once a scene, gain +2 bonus to Defense. Consequences:1x/scene
Spells (+4): 0th – one 1x/scene, 1st – one 1x/scene
Fortify (0th): Diff 11, Close, Instant; Target gains +1 bonus to next Endurance check.
Magic Bolt (1st): A8♠/P5♠, Medium, Instant; Target takes 1 wound + draw card for additional wound.
Dark Magic: Once per scene, may take a wound to gain +2 to Spellcraft check total or to draw an extra card for an extra success.
Devious: Once per target, make a Deception (Bluff) skill check vs. target’s Perception (Spot) skill check. This check takes no action. If dark elf wins, it may draw an additional card for an extra success.
Gear: Chain mail, Small shield, Short sword, Light crossbow, 20 bolts
Physical Traits
Dark elves tend to be either fairly short or of average human height. They are almost universally lithe, though they can be equally repulsive or beautiful. Height ranges from 4’ 6” to 5’ 10”, with females of generally equal height. Weight tends to range from 50-100 lbs.
Dark elves generally have dark skin tones, ranging from ash gray to night black. Arboreal dark elves have been noted to have chromatic hues of blue, green, violets or blacks. Hair color tends to be raven black, silver or white, with the albinos having a slightly lighter shade of hair than their skin color. A dark elves eyes can change color according to mood, though their hair does not. Eyes tend to be purple, gray or white. Those who have developed Darksight generally have red or yellow eyes.
Male dark elves are unable to grow beards or moustaches.
Challenges
Dark elves are fond of acquiring treasure and power, and will often raid other communities for slaves and goods.
In rare occasions, dark elves may consort with the seedier aspects of society, trading for slaves, poisons or other illegal or immoral goods.
Dark elves have a passionate hatred for elves, and the converse is generally true. When the two races learn of each other’s presence, it almost always ends in a bloody war. In rare cases, dark elves may use magic and other means to infiltrate high elvin society in an attempt to corrupt it from within.
Culture
Dark elves are grasping and selfish creatures who organize themselves into houses based on family alliances. These houses are generally ruled by the richest and most ruthless members, and are more often than not matriarchal in nature.
[FONT="] [/FONT]Individualism in the households is greatly quashed by loyalty to the house itself. Though individual members seek personal honor and riches at every turn, there are grave consequences for those who place their own personal agendas above those of the household – an individual who is cast out of their household is likely to fall victim to the depredations of the other houses – at the very best enslavement, and at the worst, torture and eventually a meal for the necrophages of their kind.[FONT="]
[/FONT] Ecology
Dark elves are generally found in subterranean lairs far from the sun-lit lands or in primeval forests where even elves fear to tread. They often constantly wage wars with the surrounding races for food, slaves and treasure.
Dark Elves on Amberos
Dark elves are the result of a mark of betrayal placed upon those elves, by the elvin king Ymin Greensbeech Earthlayer, and are composed of those elves that aligned themselves with Ziga, the queen of corruption, near the end of the Elvin Golden Age when they attempted to overthrow the elvin rule. The black curse still flows in the elves blood, and they have retreated into the caverns beneath the earth to bide their time until they are called to become rulers of the world above in Ziga’s name.