Often a prerequisite of joining the Green Lantern Corps, an indomitable will occurs when a person has unmovable beliefs or has incredible willpower. This willpower allows them to easily control their emotions. In the case of a Green Lantern Corps member, it allows them to utilize their rings without much effort. In the case of Batman, because of his indomitable will and previous use of a Power Ring, he was able to reject a Qwardian Power Ring that tried to recruit him into the Sinestro Corps.

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