Stone of Weight

Also known as a loadstone, this small stone appears nonmagical and has a lovely sheen, giving the impression that it could be a valuable or a notable item or a magic stone of some kind. When you've carried the stone on your person for 1 minute, its curse activates: the stone's size does not change, but it suddenly increases in weight to 5 Bulk. This additional weight does not cause the stone to deal more damage if thrown or used as a weapon. It reappears in your possessions within 1 minute if you discard it, and can't be destroyed or thrown away permanently, or even placed in a container that would reduce or negate its Bulk (like a bag of holding), until it is subject to a remove curse spell or similar magic effect. Once the curse has activated for the first time, the stone fuses to you.