What is the definition of Remains Weapon?

A 'emains weapon' is like a sentient, timeless bullet in a gun, forever ready to puncture through life's defenses, no matter how well they've been fortified. It's the ultimate existential threat - a relic of a bygone era, yet still capable of causing a lot of pain.

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Here's an edgy example: "The 'emains weapon' of his past betrayal still lodges itself in my heart, ready to explode with every chance I get to remind him of that forgotten bet gone wrong."