The Demon Oak Quest/Spoiler

Method
[This quest has already been finished by players on Astera such as some other players on other worlds, that was before the patch CipSoft made. The only player that knows how to do this quest now after the patch update is

Macrone
].

You need to go in Plains of Havoc and search for a place with a lot of Dead Trees, east of Dark Cathedral, north of the vampire's house, there you'll find a corridor of 1 sqm. Need level 120 or more for teleport.

There is 5 squares that makes the Demon Oak yell. (not necessarely in this order...)