Nerissa Reventon

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Nerissa Reventon is one of the villains of the series.
She is the leader of the previous team of Guardians called C.H.Y.K.N. and was the Keeper of the Heart before power corrupted her.
She is one of the most recurring villains.
She is said to be one of the Elemental Alliance's most dangerous enemies alongside Ch'rell, Dark Mother, Kraang Prime, Prince Phobos, Shendu, The Overlord, Phobos, Andromeda, Omega, Tarakudo and other villains in the universe put together.
She is the overachiving antagonist of the Nerissa's Revenge Saga, the hidden antagonist of the Demon Chi Hunt Arc and the Book of Elements Saga, the main antagonists of the Heart to Heart and War Between Guardians Arc.
== Appearance ==
In her true form she is a old woman with long silver hair and wears a blue robe.
In her youth, her guardian form was no different from Zoey's and had raven black hair.
== Personality ==
Nerissa is calm and calculating, and she will step on or over anybody in order to further her cause. 
She even gave birth to a son so that he could overcome her enemies and lay down the foundations for her rise to power. 
She has an unshakable belief that it is her right to take control of the universe and to reshape it in her own image, and to attain absolute peace across the universe, even if by force.
Nerissa is also a very skilled actress, as she was able to fool everyone, including the Oracle, that she was the Mage and Trill without giving away suspicion, until she purposely exposed herself. 
She was also able to fool Kadma and Zoey when she was running away from them in order to get Kadma to absorb the Heart of Meridian into the Heart of Zamballa, and fool the Guardians that she did not want them to rescue Yan Lin. 
It is obvious from that she also has a lot of patience, as she was forced to wait approximately 14 years to get the Heart of Meridian.
Despite her moral and ethical flaws, Nerissa, does show signs of remorse.
Despite her calm exterior she is prone to fits of emotion, as shown when her son Caleb refused to join with her, although she does not show it, Nerissa is consumed by feelings of guilt over Cassidy's death and when Halinor and Yan Lin said to her "Are you going to destroy us like you destroyed Cassidy, does her memory mean so little to you?" Nerissa responded with strong emotion: "You have no idea what she meant to me" before screaming "This is not over" and fled, leaving Yan Lin, Halinor and the Guardians alive even though she could quite easily have destroyed them showing that she still harbored a strong sense of friendship, regret and care for her former friends.
These feelings are later further highlighted in the fact that she had purposefully gathered her former teammates together and went the extra mile in recruiting them despite not actually needing to due to her remaining sense of camaraderie with her former team, as seen when she went through the trouble of summoning Cassidy's ghost and apologizing to her for her death and going through the trouble of creating a Altermere of Yan Lin to corrupt to complete her team and sharing the powers of her Seal with them despite her own obsession of hoarding power for herself which should have lead her to instead make herself into a Quinto Guardian rather than splitting it between them.
This shows that despite all of her vile actions and her supposed "destiny" to remake the universe and bring about universal peace and her fanatical belief in her conquest, Nerissa is in truth an incredibly lonely person and despite her claims that she does not regret her abhorrent actions towards her old friends, she in truth misses them dearly and desires and yearns for their companionship once more. 
And as seen in her prison dream world, Nerissa also loves and misses/yearns for both her son and her former lover, as seen where she sees herself ruling the cosmos together with her family.
== Powers, Skills & Abilities ==
As the former keeper of the Heart of Kandrakar, Nerissa has all of the same powers as the current Guardian Zoey, although she is much more experienced in using them, and much more aware of their true potential, than her younger counterpart. 
However, Nerissa is no longer connected to an auramere so she must fuel her powers from other external power sources.
Nerissa's more insidious powers (which Zoey may come to possess) are her abilities to control dreams and manipulate the minds of others.
She has entered the girls' dreams, turning them into nightmares. 
Moreover, the dreams may occasionally affect the real world as well. 
Nerissa also had the ability to manipulate minds. 
When Nerissa turned Matt into Shagon, not only did his personality change, but he also became completely loyal to Nerissa. 
Additionally, Nerissa had the ability to enthrall the former Guardians once she discovered the "chink in armor of their souls."
* Spell Casting: The power to cast spells; a "spell" being the word used to signify the means employed to carry out a magical action. Nerissa was quite knowledgeable about spells, as she was able to place a spell on Blunk's Tonga Tooth, enabling her to track its folding movements, and she summoned the Annihilators to attack Meridian.
** Glamours: Spells that change one's appearance to look like another person, though it can also be used to change a person's age or clothing; unlike shape-shifting, glamour spells creates an illusion around the body, whereas shape-shifting causes a physical change. Nerissa made frequent use of glamours, posing as the Mage and Trill respectively. However, because she isn't actually changing the shape of her body, her shadow can still be seen in her true form. This allowed the current Guardians to find out who she was when she transformed into the Oracle and tried to get the Heart from Will.
** Mind Manipulation: Nerissa displayed various forms of mental manipulation, only one of which was explicitly stated to be a spell. She cast an infatuation spell on the men and boys at Heatherfield.
** Dream Manipulation: Nerissa employed dark magic to control and manipulate the dreams of others. She displayed this ability when she attacked the Guardians in their dreams. She even caused these dreams to manifest in real life, drenching Cornelia with water and taking most of Irma's voice away. When the Guardians faced her in a "mutual dream", they were able to defeat her and create a psychic backlash, which knocked her from the dream plane.
** Curses: Nerissa claimed to have cast a devastating curse on two talismans that allowed folding and used magic to disrupt the Oracle's powers.
* Limited Shape-shifting: Using the Heart of Kandrakar, the Guardians can magnify their powers and alter their appearance to their benefit. When the Guardians transform, they change form, height and grow wings.
** Enhanced Strength: The Guardian of Quintessence seemed to have degree of enhanced strength when transformed. While it was not clearly displayed, it is assumed that Nerissa has a degree of superhuman strength and durability, much like Will does.
* Regeneration: According to the Oracle, the nymph Xin Jing gifted the Guardians with the power of regeneration to allow them to withstand the physical strain of transforming from one state to another. Apparently, every time the Guardians are touched by the power of the Heart of Kandrakar, they become stronger; they are afforded supernatural longevity (e.g. this allowed Yan Lin to serve as a Guardian for longer than any ordinary mortal could have) and little physical imperfections disappear overtime (e.g. Taranee's eyesight improved because of this gift). The Oracle also stated that this gift can be refused.
* Tele-transportation: In order to travel to another place in the same world, each Guardian can teletransport. Teletransporting is a difficult ability to learn and one can materialize into another solid object if not careful enough. If a Guardian teletransports while not connected to an Auramere or a mystic Heart then they will drain their life force.
As the former keeper of the Heart of Kandrakar, Nerissa possessed the power of quintessence, and had all of the same powers as the current Guardian, Zoey, although she was much more experienced in using them, and much more aware of their true potential than her younger counterpart. 
After her imprisonment and subsequent release Nerissa supplemented her former Guardian powers/abilities by using the Heart of Meridian, which she stole from Elyon, allowing her to teleport freely, even between dimensions, and greatly strengthening and enhancing all of her existing powers and abilities to even greater power levels. 
Later, Nerissa tricks Kadma, the former Guardian of Earth, into merging the Heart of Meridian and the Heart of Zamballa, and takes control of both Hearts, fusing them together to become the Seal of Nerissa. 
Further strengthening and amplifying all of her powers in all respects and raising her control and manipulation of Quintessence to the power level where she was able to turn Cassidy's spirit into pure flesh and blood.
* Electrokinesis: The ability to manipulate, control, and create pure electrical-energy; such as lightning or static electricity. This power allows the owner to control all forms of electrical power, being it static electricity, thunder and lightning, magnetic force, electromagnetic forces, or electrical pressure.
** Electric energy blasts and balls: The ability to conjure concentrated bolts of lightning into a straightforward attack, such as beams, rays, bursts, balls or blasts of lightning. Users can also shoot lightning bolts from their eyes and hair, and physically capture lightning bolts and use them as weapons.
** Electrokinetic shields and barriers: The ability to employ electrical energy as a defense mechanism, such as a shield, force field, or a standard wall of energy.
** Electrokinetic vision: The power to project electrical energy from one's own eyes.
** Limited atmokinesis: The ability to summon lightning storms.
* Technopathy: The ability to bring electrical appliances to life, granting them distinct personalities and the ability to speak. Once in such a state, only magical creatures can hear and converse with such appliances.
* Animation and reanimation: By uttering the word "Quintessence", the Guardian who commands the fifth element can animate and/or levitate objects by imbuing it with life, simulating telekinetic abilities; Nerissa most likely did this when performing acts of telekinesis when posing as the Mage. Nerissa can also create new life, as she did in order to create Ember and Tridart. Nerissa's ability to use Quintessence is so advanced that she was able to raise Cassidy's spirit, which she then bound to the mortal plain by using the Heart of Meridian, and later restored her former teammate to a physical body by using her life-granting abilities., they change form, height and grow wings.
== Weakness ==
* The Aurameres: The Guardian's powers are derived from the Aurameres, and should these objects be destroyed they will be rendered powerless.
* Mortality: Despite their mystical attributes, the Guardians are still human and share many of the same weaknesses as non-supernatural beings (e.g. age, blood loss, suffocation, etc.). However, the Guardians can get around this weakness through the use of magic.
* Magic: The Guardians are susceptible to the powers of magic. This is inclusive of mystical objects such as the Star of Threbe or the Horn of Hypnos.
* Overexertion: It has been shown that if a Guardian uses their elemental powers and is not connected to an Auramere, it will drain their life force, making them much weaker. This may be why Nerissa aged so much faster than the rest of C.H.Y.K.N.
* Team Balance: Yan Lin revealed that when the Guardians argue and are not united, their individual powers diminish in strength and they are more vulnerable.
== Weapons ==
* Scepter (Formerly, Destroyed)
* Seal of Nerissa (Formerly)
== Family ==
* Shendu (One-Time Lover)
* Julian (One-Time Lover)
* Drago (Son)
* Caleb (Son)
== Voice Actress ==
Kath Soucie.