In blackest day, in brightest night, beware your fears made into light. Let those who try to stop what's right burn like my power: Sinestro's might!

Members of the Sinestro Corps use yellow power rings built on Qward. The rings can create objects based on the wielders' own thoughts. The power rings are fueled by fear instead of willpower. The yellow rings are charged by Manhunter androids that have yellow power batteries built into themselves, which in turn are connected to a large Qwardian Central Power Battery based on Qward. The rings have no known weaknesses, unlike a Green Lantern power ring's previous vulnerability to yellow. Also, the yellow rings are not restricted from killing sentient beings as the Green Lantern's power rings were. The original Qwardian Power Rings were simple gold yellow bands with a rounded inset jewel. These were used by Sinestro, Guy Gardner, Fatality, and Alexander Nero. The current, standardized design bears the stylized lantern symbol of the Sinestro Corps. Formerly, the rings needed to be charged after a period of 24 hours, regardless of how often it was used. Currently the rings retain a charge until they run out of power. This variability ensures that the wearer takes greater effort to keep it charged. Sinestro's ring was originally charged by attacking Green Lanterns, presumably to tap into the yellow light of fear provided by Parallax who was trapped in the Green Lantern's Central Battery for eons. With the construction of the Sinestro Corps' Central Power Battery, a Yellow Power Ring has the same power limitations as a Green Lantern Ring. Also, the transmission and power of one of Sinestro's rings can be greatly disrupted by the presence of a Blue Lantern Ring.

The yellow lantern glowed eerily as Twilight activated her ring. A yellow body suit formed around her and her eyes turned yellow. However, black tendrils began engulfing her. Fortunately, Twilight used her powers to construct a sword to slice the tendrils. "Fear the Princess of Friendship!", Twilight shouted as she acrobatically flipped over the oncoming tendrils and sliced them left and right. However, the tendrils began to turn multiple ponies into Black Lanterns. Before Twilight could save them, however, a humanoid created a blockade, trapping her in the castle.

"Hello. My name is Thaal Sinsetro of Korugar", Thaal Sinsetro said. He assumed a fighting stance and attempted to defeat the pony in hand-to-hand combat. Trained at the Oan Citadel, Sinestro is an able-bodied combatant, though he rarely resorts to physical attacks, preferring instead to use his Qwardian power ring for offensive maneuvers. However, it seemed as if he was... training her? No, that couldn't be right. "We share a common enemy. Nekron will destroy all of- look out!" A zombified pony leaped at the Yellow Lanterns, but Sinsetro created a force field. "I thought the blockade would work!"

"Something tells me that these things aren't gonna be slain by fear", Twilight said as the horrifying monstrosities began clawing at the force field. "Man. Talk about UGLY. This reminds me of the time we pulled a massive prank on Rainbow Dash."

"The Power Ring is unique in that its base of power, fear, can be manipulated by the ring user. An opponent's fears can be laid bare by delving into their minds. The power only works on the direct emotion of fear. This allows them to create the energy constructs of an opponent's worst nightmare. Also, once that fear is exposed, the ring's ability allows the wielder to amplify the fear to the point of irrationality and true horror on the part of victim and conversely empowering the ring wielder", Sinestro said. "However, these are zombies. Something tells me nothing scares them." He looked at the Alicorn. "I wonder why the Yellow Ring chose you."

"The Blackest Night falls from the skies, the darkness grows as all light dies. We crave your hearts and your demise, by my black hand, the dead shall rise!", a distant voice said. Nekron approached the castle as Twilight created a SECOND force field using her own magic.

"Pathetic", Nekron said as he sliced through BOTH force fields with one swing of his scythe, shattering them.

"Nekron makes use of a long black scythe as a signature weapon which contains a Black Power Battery at its top and a curved blade powerful enough to rip holes in reality and harm cosmic beings such as the Life Entity itself", Sinestro explained. "He's also capable of producing powerful dark energy lightning that's able to kill even powerful immortal beings such as the Guardians of the Universe." As if on cue, Nekron used dark energy lightning to strike Sinsestro and Twilight, but the duo dived out of the way. Twilight grabbed the scythe and she and Nekron played tug-of-war with it while Sinestro battled the zombified ponies. Twilight used her powers to construct a hockey mask on her face and stabbed Nekron with a constructed machete, though Nekron was used to attacks from other Lanterns. Still, he was bleeding from the wound. The black lightning caused rain to fall.

"It's raining, you're bleeding, TWILIGHT IS STARVING!", Twilight said as she repeatedly stabbed Nekron with the machete. However, the Black Lantern won the tug-of-war and kicked Twilight across the room. Sinestro was eventually overwhelmed by the zombified ponies, but Twilight disintegrated the zombies with an extremely powerful blast of magic. Sinestro stood up as Twilight faced Nekron. "Tell me... what are you most afraid of?"

"I fear nothing. I am fear", Nekron said.

"That's a laugh. You wield the Black Ring. I wield the Yellow Ring, which means I am fear", Twilight retorted. She used her Yellow Ring to construct multiple balloons. The balloons acted like a smokescreen, allowing Twilight and Sinestro to fly out of the castle unnoticed as the rain subsided. Nekron sliced the air (creating a portal) and escaped.

"Seriously? Balloons?", Sinestro asked.

"Blame Earth", Twilight quipped as they landed in front of the castle.

"Seems like you got this under control", Sinestro said. The Yellow Lantern flew off, leaving a trail of dust in his wake as he left the atmosphere.

"I hope the others aren't having trouble mastering their Rings and bracelets", Twilight said.

Author's Note

Horror references in this chapter:

Twilight used her powers to construct a hockey mask on her face and stabbed Nekron with a constructed machete, though Nekron was used to attacks from other Lanterns.

Jason Voorhees from the Friday The 13th franchise.

She used her Yellow Ring to construct multiple balloons.

It (more commonly known as Pennywise the Dancing Clown) from the It franchise.
NOTE: I know Pennywise uses red balloons, but a Red Lantern uses rage. Rage isn't exactly what Pennywise uses when killing people.