Homebrew Fey'ri Species Details

Fey'ri are not a true elven subrace. They are to elves as tieflings are to humans and tanarukks are to orcs. The fey'ri are the result of interbreeding between elves and demons in an attempt to strengthen the elven bloodline. The fey'ri resemble elves "the way tieflings resemble humans", but generally reject the notion of elven resemblance as offensive. Some fey'ri have barbed tails, fangs, forked tongues, or horns, or any combination. Some have multiple sets of arms and one or more sets of wings. Some fey'ri are not visibly different to elves at all, and some were raised amongst elves, some never knowing their true nature.

Personality 

Fey'ri often have a talent for the use of magic. Almost all fey'ri have the ability to change shape, which aides in concealing themselves in society. Many fey'ri consider their bloodline to be very important, and pride themselves on being able to trace it back to their original demon ancestor(s). This meant that they typically only married and had children with other fey'ri, or, very rarely, elves. 

The fey'ri generally look negatively upon outsiders, but are respectful towards intelligence, strength, and flexible morals. Even once having made a "friend", a fey'ri would abandon that person immediately if the fey'ri saw that individual as more than a minor annoyance.

Fey'ri tend towards chaotic evil.

Society

Many fey'ri seek to reestablish the old elven realms of Cormanthor with themselves at its head. They have an autarchic way of live, with a strong sense of community. 

Fey'ri Names

Fey'ri mostly have elven names. Those who were a part of the Daemonfey army had their family names changed into Abyssal and somehow connected with greatness, power, and destiny, to reflect their importance for the elven kind. The fey'ri that are born today into societies that fear or shun them are often given "cursed names", which are syllables often resembling the sounds of a broken twig or dry leaves. 

Adult Names: Adran, Aust, Beiro, Berrian, Galinndan, Laucian, Mindartis, Paelias, Thamior, Tharivol, Theren, Varis, Althaea, Anastrianna, Birel, Lia, Meriele, Mialee, Sariel, Shanairra, Shava.

"Cursed" Names (Common Translation): K'rut (Drywood), Tzikiir (Poisoned flower), Qusks (Deadleaf)

Family Names (Common Translations): Amakiir (Gemflower), Amastacia (Starflower), Galanodel (Moonwhisper), Holimion (Diamonddew), Ilphelkiir (Gemblossom), Liadon (Silverfrond), Meliamne (Oakenheel), Naïlo (Nightbreeze), Siannodel (Moonbrook), Xiloscient (Goldpetal)

Abyssal Family Names (Common Translations): Nocturo (Domination), Barktumi (Conqueror), Glabnoktash (He who slays)

Fey'ri Traits

Due to their elven and demonic bloodlines, there are a collection of traits shared among all fey'ri.

Ability Score Increase

Your Dexterity score increases by 2, and either your Strength or Intelligence score increases by 1.

Darkvision

Due to your demonic heritage, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can't discern colour in darkness, only shades of grey.

Fey Ancestry

You have advantage on saving throws against being charmed, and magic can’t put you to sleep.

Trance

Fey'ri, like elves, don’t need to sleep. Instead, they meditate deeply, remaining semiconscious, for 4 hours a day. (The Common word for such meditation is “trance.”) While meditating, you can dream after a fashion; such dreams are actually mental exercises that have become reflexive through years of practice. After resting in this way, you gain the same benefit that a human does from 8 hours of sleep.

Elven Mask

You can cast disguise self with this trait, using intelligence as your spellcasting ability for it. Once you cast this spell, you can't cast it again with this trait until you finish a short or long rest. When you use this version of disguise self, you may only appear as an elf. 

Hellish Resistance

You have resistance to fire damage.

Languages

You can speak, read, and write Common, Elvish, and Abyssal.