A fire is a small pile of burning logs lit on fire using the Firemaking skill. To make a fire, players need logs, which can be obtained through the Woodcutting skill, by cutting trees. The log can then be set on fire using tinderbox (or a bow on completion of the Barbarian Firemaking). Uncooked foods can be cooked on fires but some foods can only be cooked on a range, such as raw potatoes, pies, or pizzas. Players can turn cooked meat into burnt meat by using it once again on the fire. When a fire burns out, ashes will appear in its place.
To light logs, players just need to use "Light" option on the logs in the backpack or lying on the ground. Another way is to select "Craft" option on the logs in the backpack and select "Tinderbox" in the dialogue box. If the player uses Gnomish firelighters with the logs before lighting it, they can make coloured flames, which will be the same colour as the firelighter used.
After lighting a fire, players automatically walk one step to the west. If the way is blocked, they will instead take one step east. If both ways are blocked, players will go south. If all three other ways are blocked, players will step to the north. A fire cannot be lit everywhere; you will not be able to make a fire inside most buildings, on top of another fire, or when standing on scenery such as ferns or flowers. A fire cannot be lit in front of a closed door; but can be lit in front of an open door. Attempting to light a fire in an area where fires can not be lit produces the message "You can't light a fire here."
If players light one fire and have a clear path to the west for more fires, they can immediately light the next fire by using a tinderbox with the logs just after they finished lighting the first log. This way the fire will start burning before the player even attempts to light it. This is a much faster way to burn logs than burning each one separately. This method of burning logs is called line firemaking.
If more than one player attempt to light a fire at the same spot, the first player would have a fire lit and the other players' logs would be dropped on the same spot. You may also add any logs that are up to your Firemaking level to any player-started burning fire. A good place to do this is the Grand Exchange. By selecting "Use" option on the fire and selecting "Add to bonfire", you will add all of the logs in your backpack to the fire, giving you more Firemaking experience than normal. For more details, see bonfire.
Eternal fires are useful because they do not require the player to bring along any logs or a tinderbox, saving vital backpack space. As an infinite heat source, they will not become extinguished while cooking an full backpack of food as player-made fires often do. Most of these fires have a left-click "Cook-at" option.
However, these fires provide do not provide the bonus Cooking experience when compared to ones that a player was to make. For example, when cooking a salmon, an eternal fire would yield 90 XP compared to 99 for a fire made by logs and a tinderbox.
Unlike bonfires, logs cannot be added to eternal fires to train Firemaking. Exceptions are the eternal fires in Yeti Town, on RuneFest Treasure Island, and in Prifddinas, which provide slightly more Firemaking experience than using logs on a regular bonfire. Bones cannot be added to train Prayer with Cremation.
Southern point of Mos Le'Harmless. Players can only light it after completing A Fairy Tale III - Battle at Ork's Rift. To light it they need 85 Firemaking and 8 willow logs. It rewards a one-time reward of 10,000 firemaking experience.
In RuneScape Classic, a player could only light the logs whilst on the ground.
There are a few log-less fires at the fire altar. However, they cannot be cooked on.
Players used to be able to use a jug of water or a bucket of water on a fire and put it out, causing annoyance among players who were trying to train Cooking. A hidden update removed the ability, instead giving players the error message "You can't cook that on a fire."
Previously, raw potatoes will always burn into ashes on a fire. After an update, this only yields the "You can't cook that on a fire." message.