Mnemosyne Crystal

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Real Identity: Not Applicable
Appearances (Novels): Wonder Woman at Super Hero High, Supergirl at Super Hero High, Batgirl at Super Hero High, Katana at Super Hero High, and Harley Quinn at Super Hero High
Appearances (TV Specials): Super Hero High
Appearances (Webisodes): New Beginnings, Hero of the Month: Supergirl, Batgirl vs. Supergirl, Hero of the Month: Harley Quinn, License to Fly, Hero of the Month: Batgirl, Doubles Trouble, Hero of the Month: Katana, Dude, Where's My Invisible Jet?, Hero of the Month: Frost, The Blunder Games, Hawkgirl's Day Off, Hero of the Month: Hawkgirl, The Cheetah Who Cried Wolf, Ring of Mire, Roomies Return: Frost's Bite, Batnapped, Hero of the Month: Beast Boy, Tales From the Kryptomites Part 1, Tales From the Kryptomites Part 2, Seeing Red, Around Metropolis in 80 Seconds, For Art's Sake, The Ares Up There, Body Electric, Fresh Ares Part 1, Fresh Ares Part 2, Fresh Ares Part 3, Fight Flub, Jetsetters, Dog Day After School, It's a Superful Life, Ring Me Maybe Part 1, Ring Me Maybe Part 2, Ring Me Maybe Part 3, Ring Me Maybe Part 4, Gone to the Dogs Part 1, Gone to the Dogs Part 2, Pets Peeved Part 1, Pets Peeved Part 2, Truth of the Lasso Part 3, Truth of the Lasso Part 4, Nevermore Part 1, Nevermore Part 2, Nevermore Part 3, Nevermore Part 4, Tamaranean Dance Club Part 1, Tamaranean Dance Club Part 2, By the Yearbook, Spell-shocked Part 1, Spell-shocked Part 2, Bottle Episode, Mood Ring, My New Best Fiend, Anti-Hall Monitor Part 1, Anti-Hall Monitor Part 2, Haunted Harley, All Pets Are Off Part 1, All Pets Are Off Part 2, Target Practice, For The Girl Who Has Everything Part 1, For The Girl Who Has Everything Part 2, Missing Martian, Fortress of Solidarity Part 1, Fortress of Solidarity Part 2, My So-Called Anti-Life Part 1, My So-Called Anti-Life Part 2, and My So-Called Anti-Life Part 3
Appearances (Comics): Free Comic Book Day Edition 2016, Intro to Prehistory Part 1, Intro to Prehistory Part 2, Halloween ComicFest 2016 Edition, Intro to Prehistory Part 3, The Dino Egg Effect Part 1, Savage High Part 1, Savage High Part 2, Harley & Batgirl's Excellent Adventure Part 2, Egging On Part 1, Egging On Part 2, Deja Vu Part 1, Deja Vu Part 2, State of the Martial Art, Friends in High Places, Gimme a Summer Break, One-Hit Wonder Woman, A Punch of Color, Summertime Madness, Every Trick in the Book, Painting the Town Red, The Write Stuff, Paper Trail, The Switcheroo-Witcheroo, On the Same Page, Final Draft, Two Sides to Every Story, Oa Snap, Stay Calm, Krypton, Barry-Foot in the Bark, Space Walk With Me, Planet of the Bots, Zone In, Breaking Out, Light The Way Home, Moon Doggie, Fight and Space Flight, The Final Frontier, and Teenage Crisis
Appearances (Graphic Novels): Finals Crisis, Hits and Myths, and Summer Olympus
Appearances (Books): Super Hero High School Yearbook
Appearances (Movies): Hero of the Year
Appearances (LEGO Webisodes): Need for Speed, Trading Places, Crazed & Confused, and Wonder Waitress
Appearances (LEGO TV Special): Galactic Wonder
Powers/Skills: Power Source
Voiced By: Not Applicable

While out with Comet and Krypto, Kara discovered a Mnemosyne Crystal. She presented it to her mother Alura. Alura polished it and fitted it on a necklace. She also programmed the crystal so Kara would always remember her family and home and set it to activate once Kara was old enough to understand. When she needed to hear and see them, it would project them into Supergirl's mind. On the day of Krypton's destruction, Alura placed the necklace on Kara so she could always be with her. The crystal on the necklace was also the key to activate their Groundbreaker invention. Kara was launched into space to Earth. Aware of Zod's desire to steal the Groundbreaker, Alura and Zor-El also programmed a crystal with a failsafe and put it on Krypto's dog tag in hopes he would find Kara eventually and pass it on to her. Dark Opal discovered a legend about how the last gem of an extinct planet bound with treasure from across the universe would yield ultimate power. Kara kept it as a mere good luck charm.

During the siege on Super Hero High by Granny Goodness, Batgirl constructed a De-Trancer to neutralize Granny's brainwashing frequency but she needed something to conduct the power like a crystal. Supergirl lent her crystal and it worked. Batgirl attached the De-Trancer to the Mother Box on the Amethyst and returned the student body and faculty back to normal. After Batgirl used a police sketch program to print out a surprisingly accurate image of Supergirl's parents, Supergirl hung it up by her bed and went to sleep. Her Mnemosyne Crystal activated. Dark Opal sensed the crystal and concluded it was the gem he was searching for. The next day, on Themyscira, Supergirl was thinking of home and the crystal projected her into a memory of home on Krypton when she first discovered the crystal. While the Metropolis Junior Detective Society pondered the threat of Dark Opal, Batgirl suspected a connection to Supergirl's crystal. She ran some readings on it and discovered a repeating pattern like Morse Code.

Supergirl revealed to them it was from her mother. It projected her into a memory of when she was launched from Krypton. Supergirl believed the signal meant her parents were still alive and trying to find her. One of Eclipso's Shadow Demons attempted to steal the necklace while Supergirl slept. A powerful protection aura around the crystal shocked the shadow. Dark Opal realized it couldn't be stolen, only freely given away by Supergirl. Opal disguised himself as Alura and tried to trick Supergirl. Supergirl saw through the ruse. Eclipso and Opal kidnapped and held Hippolyta, the Kents, and Commissioner Gordon hostage. They wanted the crystal in exchange for the parents. Supergirl had little choice and gave the crystal over. The crystal powered the Scepter made from the other stolen treasure. She planned to destroy Gemworld first but Opal objected and fought her for it. Supergirl used her heat vision on the crystal and destroyed the Scepter. After Eclipso and Opal were defeated, Bumblebee located a piece of the crystal on the lawn.

Supergirl said goodbye to her mother and a tear dropped on the piece. It activated. Alura told Supergirl nothing could destroy the crystal because nothing could destroy her love for her. Alura instructed her to share that love with others and create a new family. Meanwhile, Bumblebee shared a theory with Batgirl that the crystal would have had enough power to recharge her suit since it powered the Scepter. Batgirl mused they could replicate it with a synthetic version after studying the piece. Supergirl overheard the conversation and used her heat vision to cut out a sliver of the piece. Batgirl got out a tweezer and placed the sliver into the suit's pack. It worked and Bumblebee was restored to normal size. In order to turn Oa into New Krypton, Zod required a Mnemosyne Crystal for his device. After Supergirl arrived and learned she wasn't the only Kryptonian survivor besides Superman, Zod asked for her help and held out his device. While imprisoned, she realized the Mnemosyne Crystal was the key to the Groundbreaker.

After a brief fight, Non stole it from her. Zod concluded it was the key because it was the kind of sentimental concoction Zor-El and Alura would make. He and Faora took the Groundbreaker to the top of the Green Lantern Central Power Battery. Before they could test it, Krypto tackled Faora and the Mnemosyne Crystal fell to the ground down below. Faora went on her hands and knees and combed the ground for the crystal. Supergirl comforted Krypto and noticed another crystal on his dog tag. She realized her parents gave it to Krypto to give to her in the event the Groundbreaker had to be destroyed. Faora found Supergirl's and handed it to Zod who inserted it into the Groundbreaker. It activated and extended its legs into the Central Power Battery. Green Lantern Jessica Cruz intervened and tossed both Zod and Faora off the battery. Supergirl swapped out her crystal for Krypto's and the Groundbreaker blew up.

While in the North Pole, Captain Cold recognized Supergirl's Mnemosyne Crystal as a Kryptonian variety and wanted to use it to crystallize the oceans and create a new Ice Age. After he was captured, Supergirl got an idea. She clutched her crystal and placed it on the ground. It activated and generated a giant crystalline structure. Supergirl named it the Fortress of Solidarity and declared it was to be shared with her friends.