''The Unicorn Trilogy'' is a series of books by Creator/TanithLee:

* ''Black Unicorn'': The {{Muggle}} daughter of a sorceress, Tanaquil, accidentally resurrects the titular black unicorn, who whisks her away to Sea City, where she discovers her father and half-sister Lizra, learns of her own unique magical capabilities, and helps the unicorn return to the perfect world.
* ''Gold Unicorn'': Tanaquil is reunited with Lizra, now a conquering Empress, and is coerced into making a war machine in the shape of a golden unicorn work, causing a gateway to a hell-like world to open.
* ''Red Unicorn'': Once reunited with her mother, Tanaquil must face her own inner demons in the form of an AlternateUniverse, an EvilCounterpart, Tanakil, and the red unicorn that binds them.

!!Tropes present in the Unicorn Trilogy
* AbusiveParents: When Jaive believed that Tanaquil was talentless, she more or less neglected her. Even after they reunited under better terms, she was so caught up with experimenting with Worabex that she accidentally caused Tanaquil to enter her Inner World.
** On Lizra's front, Zorander only bothered with her when she could make him look good. Also, he tried to have Tanaquil arrested and executed (though he likely didn't know she was his daughter).
* AnguishedDeclarationOfLove:Subverted, after Honj finds out Tanaquil is near death, he makes this to Lizra, declaring that he loved Tanaquil all along. [[spoiler: As it turns out, Lizra wanted an excuse to break off her engagement to Honj anyway.]]
* ArrangedMarriage: Lizra claimed that she was already betrothed to someone to turn down The Emperor's proposal without telling him she couldn't stand him.
** [[spoiler: Later, she agrees to break off her engagement to Honj so she could enter one with an overseas king and consolidate their power.]]
* BarrierWarrior: One of the gifts the black unicorn gave Tanaquil and the peeve in gratitude is involuntary personal forcefields that protect them from anything from a wasp sting to falling out of the sky.
* ChariotRace: Of an interesting variant: the chariots are rotting chairs.
* EverythingsBetterWithPrincesses: Lizra in the first book. She also tends to lie and say the people she befriends (such as Tanaquil and Honj) are royalty as well to make them look better in others' eyes.
* EvilCounterpart: Tanakil. [[spoiler: Though she's found to have HiddenDepths and is not so bad as misunderstood]]
* EvilRedhead: Subverted. Common belief in this world is that redheads are evil witches. Tanaquil is the RedHeadedHero, and while Jaive is a bit nutty and cold, she isn't completely evil.
** Tanakil is the EvilCounterpart to Tanaquil. [[spoiler: So she seems.]]
* FallenPrincess: [[spoiler: Lizra comes across as this when they're in the hell-like world, to the point that Bump doesn't even realize at first that she's the Empress]]
* {{Familiar}}: The peeve.
* GodSaveUsFromTheQueen: Lizra in Gold Unicorn
* HeroesWantRedheads: Honj and Mukk both were interested in Tanaquil
* HumansAreBastards: Which is why their world is imperfect. Just stepping in the perfect world causes ruin to it.
** The hell-like world exists because its gate is a war machine created by Lizra and her army.
* InadequateInheritor: [[spoiler: Part of the reason Tanakil is so resentful of her half sister Liliam is that despite being older, she was passed in the line of succession because her mother ran away, while Liliam's stayed.]]
* ParentalAbandonment: Zorander ran away from Jaive while she was pregnant with Tanaquil.
* RedHeadedHero: Tanaquil
* StandardHeroReward: Everyone presumes that this is Honj's reward for 'saving' Lizra from what the people believed were kidnappers. [[spoiler: It ends up being broken off so Lizra could marry an overseas king and Honj could be with Tanaquil.]]
* StealthPun: There is a type of animal called a "peeve", and Tanaquil has one as a companion. You might say she has a pet peeve.
* TalkingAnimal: One of the peeves around Jaive's fortress becomes this due to the excess of magic, and becomes Tanaquil's familiar.
* WellIntentionedExtremist: Lizra, after becoming the Empress Veriam, whose intention in conquering all those lands is to create a perfect world in their world.
* WhatKindOfLamePowerIsHeartAnyway: Tanaquil's magical capabilities lie in her ability to mend and fix anything, sight unseen [[spoiler: up to and including a broken heart]], and render it incapable of ever breaking again.
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