Eleanora's Cursed Weapon
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Eleanora showed me a spear she had, this very spear had been growing stronger ever since I gave it to her and she bathed it in the blood of the demons we defeat as a daily basis, I still didn't knew if it was completely the truth, but it really seemed that something like that was truly happening, the spear itself was evolving strangely.
It was the same way as Gluttony? Certainly not, it was acquiring a different nature than Gluttony. Every Cursed Weapon was always unique unless you mass produced them through a similar method, but whenever they surged naturally like Gluttony and Eleanora's spear, they developed their own unique traits.