Syd possesses all of the standard powers of a Strigoi but to slightly stronger proportions because she was turned by the alpha. Because of their lower numbers, Syd is actually currently the strongest female Strigoi alive and one of the strongest Strigoi in the world.

The supernatural forces that sustain Strigoi also endow them with superhuman physical abilities as well as powers of mind control. Their physical abilities such as strength, speed, agility, durability, healing, and senses all grow stronger with age and experience. Strigoi who feed on animal blood will not be as powerful as those who feed on human blood. Human blood is also known to increase the speed of healing when ingested by a Strigoi after being seriously wounded.

Super Strength: Strigoi are noticeably much stronger than hunters, vampires, werewolves and humans and slowly grow stronger as they grow older. They always have the advantage of superior strength in direct combat with a human. Even new Strigoi who are still in transition can toss an average-size, fully-grown human across a room with great speed and force. Their other feats include single-handedly lifting grown men high off the ground by the throat and snapping their necks, cutting off a person's head with their bare hands, and ripping out internal organs such as hearts with little to no effort. Their strength allows them to jump higher and further than any natural creature. Strigoi who feed on humans are stronger than those who feed on animal blood. Although noted that a Strigoi strength enhances with age, it can also be noted that the emotional status of the Strigoi takes a toll on the strength.

Super Speed: Strigoi are much faster than hunters, vampires, werewolves and humans. Strigoi can accelerate their movements to cover short distances in an instant, usually faster than the human eye can see. When running across long distances, they appear as vibrating blurs of motion allowing them to appear or vanish quickly and quietly. Their reflexes and dexterity are similarly heightened, allowing them to catch certain projectiles such as arrows and thrown stakes in the air with ease. Like their strength, their speed also increases with age.

Super Agility: Strigoi possess super-human agility. They have shown that they can move quickly, jump very high, climb, and run incredibly fast without difficulty or exhaustion. Strigoi can jump with their super speed too. Strigoi that feed on human blood can jump much higher than Strigoi that feed on animal blood. This ability also increases with age.

Super Senses: Strigoi have extremely keen senses of hearing, sight, smell, and taste that far exceed those of hunters, vampires, werewolves and humans. They can hear whispered conversations, even ones in far of buildings and on phones, though most Strigoi typically learn how to tune out most ambient noises when it's not necessary to hear them. Dracula told Syd that Strigoi can turn their enhanced hearing off, which explains why they can occasionally miss auditory warnings (such as the footsteps of approaching enemies) when they're paying attention to other things. Strigoi can also smell blood from several meters away, and see in total darkness. These senses improve and grow stronger with age and experience. Their senses of taste are also enhanced as well, allowing them to detect the presence of drugs, alcohol, or vervain in someone's blood.

Super Durability: Strigoi can take a great amount of physical damage without being slowed down. Even Strigoi who have been shot with wooden bullets, which have a weakening effect on Strigoi, have been seen to continue fighting so long as they were not shot in the heart or the head. Strigoi still react to physical force in a human manner, particularly young Strigoi, who will occasionally be affected even by human-strength-level force. Strigoi can also still be stunned and dazed by strikes and trauma, though their tolerance for it will increase as they get older.

Healing Factor: Strigoi recover tissue from any form of physical damage to their bodies within seconds, though they still feel the pain of a wound before it heals. Strigoi can snap their bones back into place after they have been broken and have been seen to fully recover from gunshots, stab wounds, and torso impalement very quickly, so long as they had consumed a regular diet of human blood prior to the injury. Those Strigoi who feed on animals will still heal much faster than a human, but their injuries, especially severe ones, will take much longer to heal than a Strigoi who feeds on human blood. Also, a Strigoi's enhanced healing is limited to physical damage to their bodies—many forms of magical damage and psychological damage are beyond its capability. Strigoi cannot grow back body parts, though they can reattach the severed limb with some effort.

Immortality: A Strigoi stops aging once turned. Upon their transformation, Strigoi become immune to all conventional illness, diseases, viruses and infections. While Strigoi who were cancer-free as humans will be immune to cancer after they are turned, those humans who were turned while they had cancer will not only still have it as a Strigoi, but their newly-enhanced healing factor will accelerate the progression of the cancer cells over two-fold, nearly always causing the cancer-stricken Strigoi to kill themselves to end their suffering.

Enhanced Emotions: Strigoi experience emotions more powerfully than humans. Emotions like love, joy, and happiness are magnified for Strigoi, allowing them to live life more intensely. This ability allows Strigoi to feel emotions at their peak regardless of their age. Conversely, sadness, depression, guilt, fear and anger are also amplified, causing many Strigoi to become so overwhelmed that they "turn off" their humanity to block out the more painful emotions. After time and practice, the overwhelming sensations of heightened emotions fade as the Strigoi learns to overcome their emotions without turning off their humanity all together.

Emotional Control: Strigoi have the supernatural ability to remove or dull their emotions by "turning off" or "switching off" their humanity, which is directly connected to their emotions. Doing so allows them to block out their more negative emotions, such as fear and guilt, allowing them to feed and kill without remorse, go against any opponent without fear, and relieve themselves of painful feelings such as grief, loss, depression, and shame. A Strigoi without their emotions is far more calculating and direct than one who keeps them on. However, the Strigoi can become a remorseless killer, and are almost unrecognizable from the person they truly are, as blocking out negative emotions also causes their positive emotions to become dulled or nonexistent as well. Strigoi are capable of turning their humanity back on and bringing back their emotions, but it is difficult as a result of the fact that they will be bombarded with all of their repressed emotions in addition to the guilt of anything they did without their humanity (such as killing or torturing innocent people or loved ones) with enhanced intensity. This ability fades with time and Strigoi who are over 500 years old have said that they have lost the ability to turn off their humanity altogether.

Mind Compulsion: Strigoi have the ability to influence and control thoughts, emotions, and behavior and can alter or erase memories. There is a sort of hierarchy as to how this ability works. Strigoi can compel humans, untriggered werewolves, vampires and most other supernatural species. However, no Strigoi can compel witches, demons or angels.

Telepathy: Strigoi have a limited form of telepathy that allows them to easily enter the minds of humans, and with more effort, the minds of most supernatural creatures, even powered down angels. They can also enter the minds of other Strigoi, though this ability is dependent on the Strigoi being younger or weaker than the one using telepathy. It is one of the hardest abilities to master, and because of this, it is usually the last of the mind-control-related abilities a Strigoi learns after becoming proficient in mind compulsion. Normally, this ability works through tactile contact, usually by the Strigoi placing the palms of his or her hands on the temples of the person whose mind they want to enter. The Strigoi then closes their eyes and focuses on the information they wish to seek, allowing them to sort through their victims' memories until they see what they're looking for.

Dream Manipulation: Strigoi can also use their power of telepathy to control dreams and the subconscious. This is an aspect of telepathy that is much easier to learn, and with it, a Strigoi has the ability to produce and modify dreams, bestow nightmares and lucid dreaming, distort people's perception of reality and trap someone in their dreams. However, this is a learned skill that requires practice to achieve.

True Face: A Strigoi's true face is the appearance they are hiding under their normal human face. When a Strigoi's true face is revealed, the sclera of their eyes turns blood-red, dark veins appear under their eyes as the blood pumps forcefully through them, and their canine teeth extend into razor-sharp fangs. A Strigoi's fangs are extremely sharp which gives them the ability to tear into almost any substance (including and especially flesh) and tear off limbs. A Strigoi's true face will appear for the first time either while they drink human blood for the first time or shortly afterward. With the fangs come the darkened veins under the eyes as well.

Abilities:

Master Hunting Skills: Trained up by John from a young age, Sydney possesses excellent combat and hunting abilities; she is more than capable of taking a stand against even the most formidable of opponents, such as demons, vampires and werewolves.

Marksmanship: Sydney is well-versed with multiple types of firearms and is an expert marksman, she seldom misses her intended target and can efficiently put down anything vulnerable to bullets. Her enhanced senses and speed also aid her.

Master Swordsman: Sydney is highly skilled with knives and other bladed weapons.

Multilingualism: Sydney is fluent in English, Aramaic, Latin, Romanian, and proficient a few other languages from her travels.

Weaknesses

If Strigoi are killed by a wooden object stabbed through their heart, their body desiccates into a gray color, and their vampiric veins thicken and protrude from their skin. Strigoi can build up tolerances to some weaknesses, such as vervain, allowing them to help lessen the likelihood that it will seriously incapacitate them when used by enemies. However, it will still burn them upon contact, but if ingested, it will not weaken them as much if they take small amounts over time to increase their immunity.

Animal Blood: Animal blood, while somewhat satisfying a Strigoi's hunger and sustaining their undead life, will make the Strigoi considerably weaker than they would be if they had drank human blood, causing their physical abilities to be inferior to a human-blood-consuming Strigoi, making them heal much more slowly, and making their compulsion less effective.

Broken Neck: Breaking a Strigoi's neck will not kill them, but it will render in a death like state for varying amounts of time, depending on the diet and age of the person in question. It was shown when the Enhanced Original Strigoi Alaric, snapped Damon's neck, he recovered quickly due to the fact that he is an older Strigoi.

Decapitation: Dismembering or manually removing the head of a Strigoi will result in instant and permanent death.

Desiccation: Strigoi who abstain from blood for extended amounts of time will eventually desiccate and mummify. Witches can use magic to desiccate a Strigoi, and the British Men Of Letters also developed a serum that would cause desiccation in a Strigoi if they were not given an antidote within a short matter of time.

Fire: Strigoi are highly flammable and sensitive to fire, and will quickly burn and die from it if the flames are not extinguished in time. This quality has been proven to be useful in disposing of the remains of a dead Strigoi without any physical evidence. However, in some cases, Strigoi have used this vulnerability to their advantage, such as removing their daylight rings and exposed their hands to sunlight near an open gas leak, causing explosions and fireballs to incapacitate or kill their enemies and dampening the flames before they can do harm to themselves.

Heart Extraction: Removing the heart of a Strigoi will result in permanent death. Strigoi have the strength to plunge their hands right through the flesh of humans, hunters, werewolves, other Strigoi and lots of other supernatural creatures, allowing them to punch their hand through the thorax of a person and pull out their heart. If it is a Strigoi who has been subjected to this, then they will desiccate upon their death, causing their bodies to become a grey, dry husk with their vampiric veins exposed all over their body.

Invitation: Strigoi cannot enter a home without an invitation by the owner. If a Strigoi that wasn't invited in a human's house is forcefully shoved into the threshold, they will begin to bleed from the nose and eyes and feel immense pain in a similar manner to a Pain Infliction spell. It has been revealed that invitation can be granted long-distance and even by someone who hasn't lived in the house in years.

Magic: Strigoi are susceptible to the powers of witchcraft. This is inclusive of mystical objects. Witches have been seen to use magic to cause agonizing pain by inducing aneurysms in their brain or muscle spasms, telekinetically ripping out their hearts or snapping their necks, magically increasing their hunger for blood to unbearable levels, setting them ablaze with a single thought, and desiccating them to the point of mummification.

Physical Trauma: Minor physical injuries such as gunshots, stab wounds and broken bones will cause a pain and also slow them down. However, this is momentary as they will heal completely within seconds so long as they haven't been weakened by other means such as vervain or werewolf bites.

Poison: There have recently been various poisons shown invented by people such as the British Men Of Letters that are capable of incapacitate or desiccate a Strigoi when administered.

Sunlight: Sunlight and UV rays burn Strigoi on contact, and prolonged exposure will cause them to burst into flames and die. However, this weakness can be mitigated by the use of a lapis lazuli stone enchanted with a specific protection spell by a witch for a particular Strigoi, which is usually affixed to jewelry, though it requires the Strigoi to wear the stone at all times.

Vervain: Exposure to or ingestion of vervain causes a Strigoi to become severely feverish and weak to the point that it can even hinder their healing abilities as well. Also, physical contact with vervain will burn a Strigoi's skin. Strigoi cannot compel anyone who has ingested vervain or has it on their person. Many Strigoi drink small amounts of diluted vervain to reduce its effects when used against them by enemies.

Werewolf Bite: The bite of a werewolf is extremely lethal to Strigoi. It will cause them sickness and hallucinations for several hours or even days, depending on how many bites/how much venom was ingested, until their body heals itself.

Wood: Wounding a Strigoi with a wooden weapon such as wooden bullets will incapacitate them, and it will take longer for them to heal their injuries than if the wounds were caused by any other substance. Stabbing a Strigoi through the heart with a wooden stake will result in instantaneous and permanent death.