After Gareth (Valeriu Bazu), king of Britannia, passes away, his estranged twin grandchildren, Edric (Tom Rhys Harries) and Mehgan (Jessamine Bliss Bell), fight each other for the throne using their inherited dragon strength and fire powers. When Vikings from Daneland, led by Thorgrim (Andre Eriksen), steal the Heartfire — Drago's source of power — and challenge the siblings' rights to the throne, Edric and Mehgan must set aside their sibling rivalry, or the kingdom may fall.
The film's sequel, Dragonheart: Vengeance, was released in February 2020.
Dragonheart: Battle for the Heartfire contains the following tropes:
- Accidental Murder: Edric explains to Drago that Mehgan's flames got out of control and set the house ablaze when she was mad at her father, and he died in the fire. Later, Mehgan reveals that she set the house on fire only to hide the fact that Edric accidentally killed their father when he pushed him onto a sharp spike without realizing it during an argument and stormed out of the house.
- Action Girl: Mehgan. In her very first in-person appearance, she led an army of Vikings into battle.
- All There in the Manual: The official Facebook page revealed
the names of the dragons Drago raised, as they appear on the castle murals: Draco, Siveth, Kinabalux, Basilor, Tatsu, and Vipero. - Arranged Marriage: Mehgan "un-arranges" one for a young woman.
- Ascend to a Higher Plane of Existence: Drago dies and becomes a star in the Draco constellation.
- Badass Boast:Mehgan: Just remember that when we set sail, I needed an army — and that now, I am one.
- Big Damn Heroes: Drago shows up at the perfect moment to save Edric, and later both of the twins, and then later on, the women that Mehgan trained to fight earlier show up to save her.
- Bittersweet Ending: Even though Drago has the chance to save himself with the Heartfire, he sacrifices himself so that Edric can use the Heartfire to save Mehgan, thus keeping their family together, earning himself a place in the Dragons' Heaven.
- Blood from the Mouth: Edric spits blood out of his mouth almost casually in his first appearance.
- Breath Weapon
- Broken Bird: Mehgan, to an extent. Having to grow up wearing a hood to hide the dragon scales on her face and having the ability to control fire, Mehgan was constantly accused of being an evil witch and put down by her father.
- Chekhov's Gunman: The actor who appeals to Edric in court later turns up to sneak him and Drago back into the castle.
- "Could Have Avoided This!" Plot: After Drago rescues him from a Norse slaver's ship, Edric ponders the idea that things could have been different if he trusted Drago in the beginning, especially since his sister and supposed "friend," Earl Robert Cole, were responsible for his predicament.
- Death by Childbirth: Edric and Mehgan's mother at the beginning of the film.
- Depower: Happens twice: to Drago when Mehgan steals his Heartfire, and to both Mehgan and Edric at the end of the film.
- Disappears into Light: At the end of the film, as Drago dies, his body fades into balls of starlight and ascends to the heavens.
- Doesn't Trust Those Guys: Edric and Mehgan were raised by their father never to trust dragons. Both siblings would eventually learn to trust Drago throughout the film's story.
- Draconic Humanoid: Edric and Mehgan, due to their inherited dragonheart: they both have patches of scales on their bodies, and one has Super-Strength while the other has power over fire.
- Heir Club for Men: Mehgan assumes that Edric refuses to give up the throne to her because she's a woman.
- Heroic Sacrifice: Drago gives up his Heartfire, knowing that he'll die without it so that Edric can save Mehgan's life, earning him his place in the stars.
- Hidden Backup Prince: Edric and Mehgan.
- I Just Want to Be Normal: Mehgan, when growing up.
- Interquel: Takes place around 50 years after The Sorcerer's Curse and many years before the first film.
- Karma Houdini: By the film's end, Earl Robert and Sable remain unpunished for betraying Edric and Mehgan, respectively. However, Edric will likely confiscate the Earl's lands and property for his betrayal while Sable would have to live with the fact that betraying Mehgan for Thorgrim has left her with nothing in the end.
- King Incognito: After Prince Walter runs away from home after his mother's death, he goes on to live as a commoner.
- King on His Deathbed: The situation at the movie's start and the cause of the central conflict: King Gareth is dying.
- Lineage Comes from the Father: Edric and Mehgan are royalty through their father, Prince Walter.
- MacGuffin Melee: The fight for the amulet containing the Heartfire.
- Might Makes Right: Mehgan fights with Edric over the throne because she is the elder twin and thus the rightful heir.
- Missing Mom: When her son Walter was a child, Queen Rhonu tragically died when the dragon she became bonded with at the end of The Sorcerer's Curse was struck by lightning and killed.
- My Greatest Failure: Drago claims word-for-word that the rift in Gareth's family is his.
- Mythology Gag: The campfire scene between Drago and Edric acts as a nice throwback to the same scene between Draco and Bowen in the original film. There's also the moment in the woods where Drago pins down the twins and tells them off, like how Draco talks to a pinned Bowen after their fight. In the end, Drago's ascension to the stars acts as a lovely homage to Draco's death: as the Dragonheart theme plays, Drago's body turns into light and rises into the air, an "explosion" gets reflected in the main characters' eyes, and Drago's new star twinkles in the sky.
- Never Learned to Read: Edric.
- Older and Wiser: Drago.
- Parental Neglect: King Gareth unintentionally never spent much time with Walter as he ruled the kingdom and helped Drago raise the next generation of dragons.
- Parental Substitute: Drago to Edric and Mehgan.
- Playing with Fire: Mehgan was born with the ability to control fire.
- Prequel: Takes places years after The Sorcerer's Curse and years before the 1996 film.
- Put Their Heads Together: Drago does this at one point to Edric and Mehgan to end their bickering.
- Rags to Royalty: Edric and Mehgan.
- Really Royalty Reveal: Edric and Mehgan grew up as villagers before eventually learning of their royal heritage.
- Recessive Super Genes: Despite having "dragonhearted" parents, Prince Walter didn't inherit any special abilities but his children, Mehgan and Edric, did.
- Refusal of the Call: Blaming dragons for his father's neglect and his mother's death, Prince Walter abandons his royal heritage and chooses to live the life of a simple woodsman with his children Edric and Mehgan, to whom Walter passed on his contempt for dragons. When both children were born with scales and later manifested dragon-related abilities (super-strength for Edric, pyrokinesis for Mehgan), Walter only saw such as a curse, resulting in him pressing his children, especially Mehgan, even harder to be regular people. Walter's life choices would bring much hardship to Edric, Mehgan, and the kingdom of Brittania.
- Screaming Birth: The film starts with one as Edric and Mehgan are born.
- Selfless Wish: Drago blames himself for King Gareth's family being fractured, and Drago fears he will be refused entry into the Dragons' Heaven as a result. When Walter's children, Edric and Mehgan, are discovered, Drago takes it upon himself to heal the rift between them and their family. This act is what earns him a place in the stars.
- Series Continuity Error: Assuming that the Draco in the mural is the one from the original Dragonheart movie, he shouldn't have his name yet, since Bowen gave it to him.
- The story begins with Drago assuming that he'll die with King Gareth; the only reason he doesn't is that his bond somehow passed onto Edric and Mehgan. It's the exact opposite of how it worked in the 1996 movie (as well as what happened to Rhonu between films), where the human seemingly can't die as long as the dragon is alive.
- Keep in mind that Einon was young and healthy; even if it would be possible for Draco to eventually outlive him, he very likely wouldn't have wanted to endure living with his heart bonded to Einon's for however long it took Einon to die of old age.
- We never see a mural for Griffin from Dragonheart: A New Beginning among the dragon murals which includes Draco and Siveth, even though it was heavily implied that he was one of their peers.
- Of course, considering what he became and how all we know of his past is from his own warped perspective, Griffin may have been prejudiced against humans already and "exiled" accordingly.
- The story begins with Drago assuming that he'll die with King Gareth; the only reason he doesn't is that his bond somehow passed onto Edric and Mehgan. It's the exact opposite of how it worked in the 1996 movie (as well as what happened to Rhonu between films), where the human seemingly can't die as long as the dragon is alive.
- Sibling Rivalry: Between Edric and Mehgan, as they engage in combat over which one of them should have the throne.
- Spontaneous Human Combustion: During the film's final battle, Thorgrim foolishly attempts to gain the Heartfire's power by swallowing it. He is killed seconds later as the Heartfire immolates him from within.
- The Starscream: Thorgrim, Mehgan's lieutenant, is more interested in plundering Brittania for all its worth and moving on. Frustrated with Mehgan's decision to become queen, he has Sable steal the Heartfire, and he takes over the leadership of the Norse invaders, effectively becoming the film's Big Bad.
- Succession Crisis: After King Gareth's death and his son's disappearance, his twin grandchildren fight for the throne.
- Superpowerful Genetics: Edric and Mehgan have respectively inherited enhanced strength and pyrokinesis from their grandparents, King Gareth and Queen Rhonu.
- Super-Strength: Edric's unique ability from the dragonheart.
- Synchronization: This occurs due to the dragonheart, but unusually since it's inherited and split by twins: Drago is bonded to Edric emotionally and to Mehgan physically.
- Ungrateful Bastard: Mehgan is angry, rather than thankful when Edric saves her from being killed in her sleep by Sable.
- Unto Us a Son and Daughter Are Born: Edric and Mehgan.
- Wardrobe Wound: When Mehgan sends fire at him, Edric doesn't seem to notice his burn wounds, only looking down and saying, "My shirt!"
- With My Hands Tied: Edric challenges Thorgrim to a fight this way, tying one hand behind his back.
- Wouldn't Hit a Girl: Edric, at least until now.Edric: Do you know what, I've never said this, but I really wish you had been a brother.Mehgan: Why's that, Eddy?Edric: Because I would have done this much sooner. (punches her)
