Justice League: Why Darkseid Couldn't Wield The Green Lantern Ring

screenrant.com:

Darkseid comes dangerously close to obtaining a Green Lantern ring in Zack Snyder’s Justice League, leading some to wonder if the Apokoliptian warlord could wield the alien weapon. Green Lantern rings are the source of power for the DC Universe’s Green Lantern superheroes, and one was wielded heroically in a Justice League flashback sequence. The rings, as programmed by the Guardians of the Universe on Oa, are notoriously particular about who can use them, based on an individual’s willpower and adherence to a particular set of ethics.

Green Lantern rings are among the most powerful items in any DC Universe, with the Guardians on Oa granting them to beings so they can protect their respective sectors of the universe. The rings grant infinite power to their wielders, allowing them to create constructs limited only by imagination and willpower. Only the most fearless, strong-willed, and noble beings can become a Green Lantern, and in Sector 2814, beings like John Stewart and Hal Jordan were chosen to become Green Lanterns over even Wonder Woman, Batman, and Superman.

Related: DCEU: Every Hero Darkseid Has Defeated (Including Snyder's Knightmare)

In Justice League, Darkseid brutally kills Yalan Gur, a Green Lantern and one of the many defenders of Earth during Darkseid’s invasion. Before Darkseid could take the ring, he was hit by arrows fired by Artemis, allowing the ring to fly off in search of a new wielder. Had Darkseid taken the ring, however, he wouldn’t have been able to wield it. Even if the supervillain has the necessary strength of will, he embodies the malice and oppression that the Guardians fight against, and he seeks the Anti-Life Equation, whose purpose is antithetical to the Green Lantern Corps’ ideals.

There