The Demon Oak Quest/Spoiler

== Requirements ==
* A Holy Icon.
* An Axe.
== Method ==
First, you need to go to the Plains of Havoc and search for "the infested area" (). It is surrounded by a lot of Dead Trees, east of Dark Cathedral and north of the vampire's house. There you will find a 1 sqm corridor that leads into the center (there is no Gate Of Expertise but you do need to be level 120 or above to be eligible for entry). If you have the Holy Icon with you, you will be teleported into the infested area. 
Upon entering the area you will receive this event message:
 
However, once inside the infested area you must then leave and speak with Oldrak in the Plains of Havoc Temple who will then make you a Hallowed Axe after bringing him a normal Axe and 1,000 gp.
Once you have acquired the Hallowed Axe return to the Demon Oak and start to attack its 4 most vulnerable points:
# The left spiked ball
# The bird
# The face of the tree
# The right spiked ball
Attacking these four points will anger the Demon Oak and cause him to summon monsters. Every time you attack one of the points, you will lose 300 hitpoints (Earth Damage). Once attacking the four points you will have to keep attacking that same area until it is "Dead" (it will "puff smoke"). Depending on which order you choose to do the four points the demon oak summons different monsters.
Here's the pattern:
* Left spiked ball:
** 5th hit = 3x Braindeaths + 1x Bonebeast
** 10th hit = 2x Betrayed Wraiths
* Bird:
** 5th hit = 3x Liches
** 10th hit = 1x Dark Torturer + 1x Blightwalker
* Right spiked ball:
** 5th hit = 3x Banshees
** 10th hit = 1x Grim Reaper
* The face of the tree:
** 5th hit = 2x Giant Spiders + 1x Lich
** 10th hit = 1x Undead Dragon + 1x Hand of Cursed Fate
For hits 1-4 and 6-9 it's random if the demon oak summons nothing or 4x bonebeasts.
The 10th hit on the last of the four points is always 1x Demon instead of what should've spawned, i.e. if you do the face last you get the Demon instead of the Undead Dragon and the Hand of Cursed Fate, and if you do the left spiked ball last you get the Demon instead of the two Betrayed Wraiths and so on.
Image:Partstousehallowedaxe.jpg|Use Hallowed axe in these areas
Once the tree is 100% dead, you may leave again. Upon exiting the area you will receive the Herbicide achievement and the following message:
Thus, speak to Oldrak again to tell him you have defeated the Demon Oak. Once this is done, go to a grave stone which is located south of the infected area with the name of "Yesim Adeit" (Which can be read as "Yes I made it"), . Use the Grave Stone (you may have to remove a Star Herb that spawns on top of it) to enter the rewards room and choose your reward.
Additionally, you are now eligible of obtaining second addon of Demon Outfits.
Demon Oak quest by a level 307 Master Sorcerer
Gravestonedemonoak.jpg|Grave Stone
Demon Oak quest Reward Room.png|Reward Room (Old)
Demon Oak Reward NEW.jpg|Reward Room (New)
==Transcripts==