Urns

Urns are a type of pot that can be made using the crafting skill. They were released on 15 February 2011 and were first mentioned in the February 2011 Behind the Scenes article. While training fishing, mining, smelting, cooking, or woodcutting, urns will "collect" scraps and eventually become full based on the experience gained from the activity. Once full, the urn can be teleported to Ernie for additional experience in the skill that was being trained to fill the urn. The amount of additional experience received from teleporting a full urn equates to exactly 20% of the experience used to fill the urn.

Only "base" experience counts towards filling the urn. For example, if you were to mine two ores at once using the Varrock Armour, only the experience from the first ore will be added to the urn, but not the second. Anytime "bonus" experience is given (such as Penace Horn or Sacred Clay item, or a special experience gain such as a minigame reward or Genie Lamp), it is not counted towards filling the urn.

Urns filled by killing demonic creatures that drop ashes are treated a little differently, since the prayer experience is tied to the ashes themselves, rather than the activity of killing the monsters that drop them. The additional experience is still 20%. However, it is an increase over what players would receive if they simply scattered the ashes, rather than collecting them. Also, all the prayer experience is gained at the moment the urn is teleported, rather than as the ashes are collected.

Urn creation
Note: A fired urn without a rune attached is tradeable; all other urns are untradeable.

First, the player must go to a Pottery wheel and use 2 pieces of soft clay on the potter's wheel. Players must then select a type of urn and craft it on the wheel to make an Urn (unf). The types of urns that players can craft depends on the player's crafting level. Urns that require a higher crafting level to create will catch scraps from higher level training activities. The Assist System can be used to craft urns that are above a players crafting level. Alternatively, the urn (unf) can be bought from other players.

Once a player has an Urn (unf), they can then use the urn on a pottery oven to make an Urn (nr). Players must then add a rune to the urn in order to make an Urn (r) wich can be used to gain bonus XP. Each urn uses the following rune:
 * Fishing - Water rune
 * Cooking - Fire rune
 * Mining - Earth rune
 * Smelting - Fire rune
 * Woodcutting - Earth rune
 * Prayer - Air rune

Players can then train any skill as they normally would with the urn in their inventory. When the urn is full, the player will receive a chatbox notification and the Urn (full) will have a teleport option. Players can then teleport the urn to receive experience.

Urns
You will need to finish the urn that you have started filling before you can fill another of the same skill type. You may have multiple urns from various skills, however; you could start filling a cracked fishing urn while you are still filling a cracked mining urn, for example. You may only have 10 non-empty urns in one skill type at a time (these are urns with any number of scraps in them: a pot with one scrap in, all the way to a pot that is completely full). Unfired urns, urns without runes, and empty urns with runes do not count towards this total.

Percentage formula
You can use the following fomula to estimate the percentage increase in filling the urn per unit material. 20 x (unit exp / urn exp)For example: A yew log gives 175 and a strong woodcutting urn gives 1662.5 exp. The formula estimates:

20 x (175/1662.5) = about 2.1% per log.

Trivia

 * When begining a new urn, a message will say "You begin a new urn." in light orange. Player will be also informed about filling 25%, 50%, 75% and 100% of the urn.
 * Checking the level of a 50% full urn will result in a message saying "This (name of urn) is half full, or is it half empty?"
 * Teleporting 100% full urn gives a message saying "You activated the rune on the urn and it is teleported away. You gain (amount of xp, skill name) XP."
 * You can only have 10 urns (full) of a single type.
 * Urns will spill over into each other if an action will overfill the first one for that skill and you have another in your inventory.
 * They are completely unaffected by experience boosting items such as the penance horn or sacred clay. This applies to exp bonus finally and the percent gathering for actions.
 * When you start using an urn in a skill, the examine text changes from "This will collect (whatever) when I (skill) at or below (skill and level)" to "This is collecting (whatever) when I (skill) at or below (skill and level)
 * Cutting choking ivy will not add to the woodcutting urn because ivy does not give any logs.
 * If you destroy an urn, all progress and bonus experience is lost. This is true even for ash holding prayer urns; if you destroy the urn the ashes disappear and are lost.
 * Ashes collected prior to activating a prayer urn (using an air rune with the urn) can not be added to the urn, the urn will only collect the ones immediately retrieved after a kill.