The game should not assume heroes all carry an unlimited invisible box of matches to light candles and lamps with. Doing that should require a fire source, whether that is Fire Brand, lava, a fire trap, the wand of fire, the fireball spell, or an already lit candle, lamp, or potion of oil. There could also be a new “lighter” tool which enables you to light things, but can get lost or run out of charges.

Make the Plane of Fire more interesting by:

• Getting rid of the fire traps (which mostly serve to provide lots of message spam).
• Making the entire plane constantly deal damage if you aren’t extrinsically immune to fire, more if you lack both extrinsic and intrinsic resistance. Being close to or over lava hurts you even more, and can deal damage even if you are immune or “like fire”, possibly based on how many of the 9 squares immediately are you are lava.
• Lava can erupt randomly from lava, which does major damage for levitating over it.
• Ensure the portal cannot spawn right next to the arrival location.

New type of terrain, “fire terrain”, a square that is on fire. It displays as an orange period. (If this will be too nasty to people who play with color off, the glyph should perhaps be changed.)

• Fire terrain has a certain amount of burning wood material on it.
• Standing next to or on fire terrain grants cold resistance, but standing on top of fire terrain has the same effect as a fire trap whenever you end your turn on it.
• The fire eventually burns out and reverts to normal floor, the duration determined by the total weight of the burning objects.
• Killing a wood golem with fire or burning more than a certain weight of objects on a square creates fire terrain on that space.
• Throwing burnables onto a fire trap may make them spontaneously combust and produce fire terrain.
• Fire terrain can be used to cook corpses.
• You can create fire terrain by applying a lit candle to a space with burnables on it
• You can also create it by applying a tinderbox to a space, which is a chargeable non-magical tool. Archeologists and Rangers start with one.
• Fires provide a light source of radius 3, but cannot be moved.
• Monster AI will not travel over fire if the monster is not resistant.

Fiery monsters and possibly some demons get healed by fire traps and will deliberately jump onto them in order to heal up.

Fire/water elementals are not only uninjured by fire/rust traps, but are strengthened or healed by them.