Pure essence is a raw material used in the Runecrafting skill to make runes that are only available to members. They can create the same runes as rune essence as well cosmic, chaos, astral, nature, law, death and any combination runes. It is recommended that the player does not use pure essence to craft any runes lower than cosmic as, contrary to popular belief, pure essence does not provide any sort of bonus over standard rune essence.
To be teleported, you need to have completed the Rune Mysteries quest.
Obtaining pure essence
Here are a few ways of obtaining pure essence, besides trading with other players.
Members with a Mining level of at least 30 will mine pure essence instead of rune essence (both granting 5 xp) on member worlds at the Rune essence mine, after completing the Rune Mysteries quest. To access this mine, which contains four rocks with an unending supply of essence, players must get teleported by one of the five NPCs who are able to do so.
It is possible for players with a high Mining level and a high level pickaxe to mine upwards of 2,100 pure essence an hour. If mining Pure essence, players should consider taking weight-reducing clothing, or energy-boosting items and pouches so that more pure essence can be mined per hour. The best place to mine essence is by going to Wizard Distentor who is located in the magic guild in Yanille, but this requires 66 Magic. Players without this level should go for Aubury in Varrock. However, players can also go to Brimstail at Gnome Stronghold, Sedridor at Wizards' Tower, Wizard Cromperty in Ardougne, the Runecrafting Tutor in Burthorpe, or the rune essence mine at Lunar Isle if they so choose. However, these locations are not recommended, due to their comparatively long distances from banks.
Unlike runes, pure essence does not stack. Pure essence is one of the most commonly traded items in Runescape, due to its very high demand by Runecrafters.
Since the release of The Nightmare Zone minigame, the price for pure essence has gone down due to being able to acquire large sums of pure essence in this minigame by spending points. This has caused the price of pure essence to be lower than that of the less popular rune essence.
Dropping monsters
Monster Combat level Quantity Rarity Essence impling NA 20 (noted) Common Abyssal leech 41 1; 5; 10; 25 (noted) Common Abyssal guardian 59 1; 5; 10; 25 (noted) Common Abyssal walker 81 1; 5; 10; 25 (noted) Common Abyssal demon 124 60 (noted) Common Gargoyle 111 35 (noted) Common Banshee 23 13 (noted) Common Skeletal Wyvern 140 250 (noted) Common Corporeal Beast 785 2,500 (noted) Common Minotaur 12; 27 15 (noted) Uncommon Ankou 75; 82; 86 15 (noted) Uncommon Zulrah 725 1,500 (noted) Uncommon TzHaar-Mej 103 4 (noted) Rare Mining rocks and sources Copper • Tin • Essence • Clay • Chocolate • Blurite • Limestone • Iron • Daeyalt • Elemental • Silver • Ash • Coal • Sandstone • Gold • Gem rocks • Granite • Mithril • Lunar • Lovakite • Adamantite • Runite • Amethyst
Ores 
Copper • Tin • Blurite • Iron • Daeyalt • Elemental • Silver • Coal • Gold • Blasted • Mithril • Lunar • Lovakite • Adamantite • Runite
Salts Other mineables Clay • Soft clay • Chocolate chunks • Pay-dirt • Unidentified minerals • Granite • Limestone • Soda ash • Volcanic ash • Sandstone • Uncut gem • Rune essence • Pure essence • Dense essence block • Volcanic sulphur • Amethyst
Pickaxes Bronze • Iron • Steel • Black • Mithril • Adamant • Rune • Dragon (or) • Infernal
