The Gallbladder of Vecna

Wondrous item, artifact (requires attunement)

The Gallbladder of Vecna is a legendary artifact of... negligible releveance. The diference between having it and not having it is not very noticable, and even the problems that can arise from it are mild at best. To attune to the Gallbladder you just have to kinda think about it, I guess, and then it'll just kinda be there. If you don't want it anymore you can just get rid of it. It's not very invasive or anything. While attuned to the Gallbladder you may choose to reroll any attack roll, ability check, or saving throw once per day, which is cool I guess.

While attuned to the Gallbladder of Vecna, you must make a DC 10 Constitution saving throw every thirty days. On a failed save you get a Gallstone of Vecna. While you have a Gallstone of Vecna, you have a 50 percent chance to get disadvantage on an attack roll, ability check, or saving throw. It's not really a big deal, Lesser Restoration gets rid of it.

The whole thing's pretty inconsiquential really. Vecna doesn't really care to get it back, if he even knows it exists at all. Use it, don't, whatever. Won't really make your life any different anyway.