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Reason: Changes on the amount of runes created per essence with level boost
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For the potion flask version, see Extreme runecrafting flask.
[FAQ] • [doc]

Extreme runecrafting potions are upgraded super runecrafting potions. It is made by adding spider venom to a super runecrafting potion, requiring level 91 Herblore and granting 250 experience per potion.

When a player drinks the potion, they will get a Runecrafting boost based on their experience in the skill, from +3 up to a +17 boost at level 99. After the 6 minutes have passed, the boost will slowly degrade at a rate of 1 level per minute.

When crafting law runes this potion was able to reach an additional +1 per essence.

Creation

Extreme runecrafting (3) Extreme runecrafting (3)
Herblore-Make-X GE icon
250 XP--
Requirements
Herblore Herblore level91
P2P icon Members onlyYes
Materials
ItemQuantityPriceTotal
Super runecrafting (3)Super runecrafting (3)11,4341,434
Spider venomSpider venom1119119
Total price1,553

Flask

This potion can be made into an extreme runecrafting flask by using at least six doses of it with a potion flask. Players do not need a specific level to turn potions into flasks.

Disassembly

[FAQ] • [doc]