The extra life is a power-up which is introduced in Doom Eternal.
Doom Eternal, Doom Wiki
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How many extra lives are in Doom Eternal? : r/Doom
Cyberdemon - The Doom Wiki at
Extra life - The Doom Wiki at
Extra Extra Lives achievement in DOOM Eternal
DOOM ETERNAL - All Extra Lives Locations in Mission 1 Hell on
Extra Extra Lives achievement in DOOM Eternal
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The Blood Swamps - The Doom Wiki at
Doom Eternal - The Doom Wiki at
Doom Eternal All Extra Lifes Locations