EternalUniversalTotalEclipse vs UltraNova final battle

Sol just returned from exile on the Light Hemispheran mountains(to better himself and become the hero everyone needs) discovers Luna tortures anyone that does not bend to her will, he is petrified that his sister turned into a cold hearted monster, without Sol's leadership Eclipse took over the entire Celestial's with ease and installed herself as emperor of all.

Nova Flare uses his new heroic ability quasar(light a million times brighter than the sun) to fight Eclipse, but she has tricks up her sleeves darkest of arts Event Horizon(no light can escape, Luna is using skills other than satellite) Sol draws his Solarium Metal Sword(pierces the darkest matter) and Sub Zero Shield(freezes anything it touches besides wielder) but Luna upgraded her Lunarium staff with all her negative emotions turned into pure evil darkness(like kyber crystal bleeding).

Luna fights with pure emotion(rage, fear, and love) Sol uses logic and rationale, during this battle Eclipse tries to stab Nova with the end of her staff and choke him with the top, Sol of course blocks all of her attacks it results in a draw so they instead fight with raw power(they both are around 9.99 for reference) both fly above the atmosphere/sky and let out all of their power the diameter of blasts is the size of our solar system, Luna/Sol uses the spinning trick(energy excretes faster) Eclipse's power looks black with hints of purple + red and Nova Flare's is white with yellow + blue.

Again after fighting it comes to a stalemate Luna gets pissed that she isn't winning and goes into a rage fit, so she absorbs the dark hemispheres power for herself and reaches around 11, Sol knows he definitely can't defeat her and calls upon the rest of the Celestial's for power he climbed up to 11 as well, they heroically/angelically and villainously/monstrously transform, the polar opposites of good and evil finally emerge as EUE and HN.

EUE cackles maniacally as she fired a enormous supermassive blackhole at HN he dogged it, then created a Quasi Star sent it at EUE unfortunately she was struck by it cried out in agony "you are so dead fucker, your mine now bitch" and blasted him with all of her pent up rage, HN was distracted by seeing his opponent in disrepair so he got attacked by EUE's hatred, he bared his teeth in pain from the immense darkness.

HN had to concentrate because EUE's totality was approaching in 10 mins and when that happened EUE would become truly unstoppable, Luna was starting to lose herself as time went on, HN's sun was getting closer to being fully obscured by EUE's gigantic moon, shadow bands formed on the ground which gave EUTE the ability to rip apart the fabric of spacetime, UN had to shine brighter than ever before so he illuminated his skin and glowed so vividly that it could be seen anywhere across the Universe, EUTE says "it's too late I've finally won, mwah ha ha ha, you lose" totality struck and EUTE started to submerge the Universe in negativity and evil darkness.

Sol could feel the people around him cripple, weaken, and the life leave their bodies, he'd lost she won, no this couldn't happen he owed this to himself, his friends and family to save the day, he took a deep breath in and made the stars illuminate as brightly as they could with all of his strength, each corona of the stars shone so luminous that it was like a normal day, the black void of space became an opaque dark gray color, no matter how hard EUTE tried kill UN with her death he still remained “Why won’t you die” she angrily growled, "because I am life himself, I'll always be there"

EUTE used all of her power and directed it at UN out of last attempt to win, So he only had a split second to react, he too released all of his power back at her to defend himself, he felt the unfathomable amounts of power leave his body, their blasts touched each other, the pressure created was unbelievable, UN saw the stars around flicker from the disturbance created from the power vacuum being created, if he did not win this battle the universe could die, UN and EUTE were equal and opposite in force so he couldn’t win through strength but rather wit, so UN distracted EUTE with remarks like “with all of your power, you are incompetent as ever” “I am Competent” she barked and started to lose grip on her power, she was then over powered by UN blast, EUTE magical protection is ripped to shreds she was left vulnerable, UN has the opportunity to kill her and be the savior he was destined to be.

Sol feels heartbroken that he has to kill his sister and best friend to save the universe from death and permanent enslavement, but in last hope in her he reaches out his hand to the devil herself "I know you will remember that I love you no matter what you do Luna Cynthia Eclipse Lunaris" he starts crying and very faintly whispers "Do you need a hug" she cries in pain at her brother's kind gentle words after all the crime she committed, Sol sees that he got through to her and gives her a big hug, comforts her "It's okay we will get through this together, I promise" they minorly smile at each other.

Sol and Luna as UN and EUTE realized that the damage they created from their battle was irreversible, in horror  "What have I done" "Luna this is not your fault but mine"

They both transformed down and gave back their power to their respective hemispheres, “I can’t believe, I actually could do it, Take Over the Universe, I got my revenge, I showed them, but good thing you stopped my reign of terror, because I would’ve made a terrible ruler” “Luna I knew you could pull this off always had the potential within you, other wouldn’t have the motivation, to get to their full power" she nods "yeah" they kiss contently and fades to black.