From LSWiki

Nyloc:

The word Nyloc is one to inspire fear in many a civilized heart. These beings of shadowy sorcery were created long ago by the drow as a servitor species; over the centuries, more and more nyloc escaped thrallhood, and now enough free ones exist to constitute an independent race.

A nyloc resembles nothing so much as a solidified shadow; their winged forms trail off below the waist into a wispy tail, with no legs in evidence. They hover continuously, rarely making contact with the ground. They are not alive in the ways most folk consider living; nyloc are unaffected by biological effects that would slay less fey beings. They do not breathe, and can use both of their claws with equal dexterity. Nyloc are inherently creatures of darkness; their nightvision is outstanding, and none can match their abilities at stealth.

Nyloc are, however, vulnerable to many forms of energy, particularly light, due to their unusual makeup. Prolonged exposure to sunlight, for example, is known to burn their shadowy flesh. Flame and heat are known to be dangerous to them, as well. They typically live for somewhat over a hundred and ten years. Knowledge of the languages Zadjalin and Dazask is present in every newborn nyloc; this is implicit in the nature given them by their drow creators.

 /------------------------------ The Nyloc Race ------------------------------\
 | Attributes                Strength                 10 to  70               |
 |                           Intelligence             30 to 100               |
 |                           Constitution             20 to  80               |
 |                           Dexterity                60 to 100               |
 |                           Willpower                30 to  90               |
 |                           Charisma                 60 to 100               |
 |                           Perception               80 to 140               |
 |                           Size                     50 to  67               |
 | Typical Sexes                                      Neuter                  |
 |                                                    Male                    |
 |                                                    Female                  |
 |                                                    Hermaphrodite           |
 | Sex Variation in          Neuter                   Strength Max -5         |
 | Attributes                                                                 |
 |                                                    Dexterity Max +5        |
 |                           Male                     Constitution Max +5     |
 |                                                    Charisma Max -5         |
 |                           Female                   Dexterity Min +5        |
 |                                                    Dexterity Max +5        |
 |                                                    Willpower Min -5        |
 |                                                    Willpower Max -5        |
 |                           Hermaphrodite            Intelligence Max +5     |
 |                                                    Dexterity Max -5        |
 |                                                    Willpower Max +5        |
 |                                                    Perception Max -5       |
 | Languages                 Native                   Zadjalin                |
 | Innate Skills             Flight                   10                      |
 |                           Water affinity             10                      |
 |                           Entropic affinity     30                      |
 | Specialty Access          Entropic affinity     available: degree VIII, |
 |                                                    bonus: degree II        |
 |                           Radiation Affinity       available: degree VIII, |
 |                                                    bonus: degree II        |
 |                           Water affinity             available: degree III,  |
 |                                                    bonus: degree II        |
 |                           Flight                   available: degree II    |
 | Resistances               Alkaline                 immunity                |
 |                           Shock                    immunity                |
 |                           Viral                    immunity                |
 |                           Disease                  immunity                |
 |                           Photonic                 large vulnerability     |
 |                           Electrical               large vulnerability     |
 |                           Acid                     immunity                |
 |                           Poison                   immunity                |
 |                           Temporal                 small resistance        |
 | Traits                    Ambidexterity            Yes                     |
 |                           Astral Perception        5                       |
 |                           Diet                     Sanguivore              |
 |                           Heliocausticity          2                       |
 |                           Limb Regenerativity      6                       |
 |                           Night Vision             4                       |
 |                           Respiration              None                    |
 |                           Sentience                Anthropic               |
 |                           Speech Pattern           Whispery                |
 | Cultures and Homelands    Freeholder               Freehold                |
 |                           Losthavener              Losthaven               |
 |                           Lowlander                Halfmoon Bay            |
 |                                                    Sanctuary               |
 |                           Shadowmyrker             Shadowmyrk              |
 |                           Yathrelar                Yathryn                 |
 |                           Zadnothruan Wildling     Zadnothruin             |
 | Physical Characteristics  Anatomy                  Legless Clawed Winged   |
 |                                                    Tailed Anthropoid       |
 |                           Natural Weaponry         Excellent               | 
 |                           Other                    Artificially-Created    |
 | Mental Characteristics    Psi                      Psychically Alien       |
 \----------------------------------------------------------------------------/

Restrictions

Nylocs have incredible abilities, such as being able to regrow amputated limbs, ambidexterity, the ability to fly, numerous resistances/invulnerabilities -- all with no natural assimilativity penalties. However, these abilities do come with a price:

• Sanguivore diet means you will not be able to drink non-blood, such as alcohol or potions. (Unconfirmed: Nature's Reverie may permit it.)
• From what I remember, nylocs can eat corpses but not food, such as lembas or melange.
• Kurd cannot vivisect you into another race! (Warpstones remain an option).
• Because of the acid invulnerability and a quirk in the coding implementation, you will not be able to "naturally" collect the acid needed for the Power Potion Quest. There are several ways around this, but the key point is you cannot be hit by acid.
• You cannot mount other creatures (especially notable if you are a knight or a ranger) because you have no legs.

Tips

• Some NPCs, such as shopkeepers and trainers, will not be able to see through your darkness. Your first order of business when newly incarnated is to get a light source, such as torches or lanterns of illumination, so you can provide light when interacting with these NPCs.
• To drink blood, you need to perform your Exsanguinating Bite attack. You could either suspending your other attacks to concentrate on feeding, or manually perform the maneuver.
• The cows & horses in Jack's Farm make an excellent source of blood for feeding, because they provide a tremendous quantity of blood are not too deadly should you be dying of starvation.
• When starving, you can also feed on corpses and meat from butchers.
• Although normal daylight will not affect you too severely, electrical and photonic damage hurt.
• Athil quinars are the basic armour type that can fully protect a nyloc. You can obtain these from Shadowmyrk.