Two new objects, spiked gauntlets and spiked boots. Both are nonmagical and made of iron. Spiked gauntlets give a large damage bonus to unarmed combat and also give more AC than standard gloves. Spiked boots give a large damage bonus to kick attacks, and allow you to walk on ice without slipping, the same as snow boots do.
Slipping on ice should carry a chance of uncontrollably stumbling onto an adjacent square, introducing the possibility that you slip and fall into water, or onto a trap, or something.
Pits created by freezing water and then digging out the ice gradually and randomly fill back in with water. But if you then try to frost walk on them (with water walking boots and white dragon scale mail), you get the following: “The water crackles and freezes under your weight. The ice breaks under your weight! You fall into your pit!” creating the pit anew on the space.
Tortles who have cold resistance don’t stumble when walking on ice, because their feet have claws to give them a good grip.
Artifact sapphire Ice-9. When it is dropped into water, it freezes the square and all adjacent squares into ice, and remains on top of the new ice.
Force-fighting a monsterless pool of water or moat or perhaps even lava while wielding Frost Brand should freeze that square into ice (or ground if it was lava).
Fire and frost horns, rather than shooting a bouncable ray of fire or cold, cause a powerful area fire or frost effect centered on you. The intensity diminishes the farther away from you it gets, but it hits every single creature in its fairly large radius (except you).
This effect could also freeze water and lava or evaporate pools in the radius of effect as well.
Freezing a fountain does something. All the following have been suggested:
Valkyries always get the snow boot bonus while walking on ice (i.e. they never stumble), even if they aren’t wearing snow boots.
Add a clear and obvious ice theme to Asmodeus’ Lair, as an indication to the player that he has nasty cold magic at his disposal.
The Valkyrie quest home level should not be all ice. It seems like a frozen lake currently.
Gehennom special room “ice cavern”, with mixed ice/regular floor, possibly with unnethack-style irregular ice walls, and containing ice devils and cold-themed items like wands of cold and rings of fire resistance.
Rolling a boulder on ice makes it slide for up to 10 squares (provided it keeps sliding over ice) before stopping. If it hits some other non-ice walkable terrain, it stops immediately on that square. It is treated like a rolling boulder trap, capable of hitting monsters in its path. This mechanic could be used in Sokoban to create interesting puzzles.
Object property “frost walker”, which only generates on boots. When worn, lava cools into solid floor and water freezes into ice in a radius 1 around the wearer. Optional if they unfreeze afterwards. Alternatively, make this an artifact pair of water walking boots.
