Character from Chainsaw Man by Tatsuki Fujimoto
A devil born from the fear of infinity — it trapped Division 4 in an infinite hotel loop on the 8th floor. Denji killed it by letting it swallow him and chainsawing for three days straight.
The Eternity Devil created a closed-loop pocket dimension from a hotel's 8th floor, trapping Division 4 in an inescapable repetition. Stairs, elevators, and hallways all looped back. It offered to release them if they fed it Denji. Instead, Denji jumped into its mouth and chainsawed from inside for three consecutive days until the devil surrendered and died. The fight was a statement: Denji is too stupid and stubborn to be trapped by existential horror.
A massive amorphous mass of flesh and faces filling the hotel's core, with countless mouths and eyes embedded in writhing tissue. Its true body encompasses the entire 8th floor pocket dimension.
Also known as: Eternity Devil, The Eternity Devil, Eternity