Portal stones: gray stones which are only useful in pairs (and which only 2 may generate in the whole game). They are used by putting one stone at a location you want to return to later, then later on activating the other one by rubbing it on your hand or something, which opens a temporary magic portal to (or levelports you to) the first stone.

A new magical gray stone provisionally called a “curse-eater”. If you are carrying one in your main inventory, every time you are hit with a curse items effect, the gray stone absorbs the curse instead and loses one level of beatitude. If it absorbs a curse while already cursed, it crumbles.

Carrying multiple stones will make a curse items effect hit only one of the stones, chosen randomly.

Whetstones, imported from SLASH’EM, but with some additional effects.

• The behavior from SLASH’EM is that whetstones can be used at a water source to remove rust and negative enchantment from edged weapons and pick-axes.
• Cursed whetstones either weld themselves to your hand or have a chance of breaking a weapon rubbed on them.
• Blessed whetstones can uncurse a cursed weapon rubbed on them, but at the cost of removing the whetstone’s blessing.
• If slingshot is implemented, rubbing rocks on a whetstone will break them into slingshot.

Characters with at least Basic in sling can do something (use a touchstone? flint stone? any gray stone?) to break rocks into slingshot, which weigh 1 and have comparable to-hit and damage to flint stones. Slingshot may be weapon-class instead of rock-class. The higher the sling skill, the more shot that one can get out of a single rock. There should also be rare silver rocks, which can be broken into silver shot.

Dwarf and gnome kings will never pick up worthless glass or gray stones on the ground (they continue to pick up all valuable gems).

Karma stone: a type of gray stone that, if it is blessed or cursed, can be rubbed on another item to transfer the blessing or curse to that item, making the stone uncursed in the process. Cursed karma stones in inventory eventually transfer their curse to a random item on their own; the stone might remain cursed after doing this. The loadstone in the Mimic of the Mines is replaced with one of these.

If you’re polyselfed to a lithivore, worthless glass tastes terrible but valuable gems taste delicious. Each gray stone gives a different YAFM: “Yabba-dabba delicious” for flint, “That was a heavy meal” for loadstone, “The stone’s texture is delightful/distasteful” for touchstone, ??? for luckstone.

Float stone, a gray stone which has negative weight. Non-stacking, and rare. If you get enough float stones to more than cancel out your own weight and the weight of any possessions you’re carrying, you levitate. Possibly doesn’t work when put into containers, or at least doesn’t get multiplied by the effect of a cursed bag of holding. May gain positive weight when cursed, or greater negative weight when blessed (or vice versa).