you You need to use a total of 500 dry piece of woods to light the cauldron, it dont doesn't matter in how many years you do that, lets that. Lets talk about how to get them, they them. They drop by the mobs who apear appear during the event in bewitched, there There is 3 fixed respawn during day from SS of the first day every 8 hours the mobs spawn when the witch ask to put it in cauldrons, cauldrons but they also spawn randomly during the 4 days of event, so if event. If you have time you can stay there and wait for respawn and farm( i farm(I've been doing that while watching movies at free time, if you go upstair upstairs it is pz so if you need a break is easy to logout or stay afk there, what i there. What I am not that sure is about if you can use the woods outside of the event, a event. A friend told me it wont count for the achivment, so i achievement so I would try to use them only during the 4 days of event, the event The alternative of farming is buyng the woods ( i dont buying the woods (I don't recommend that they are really expensive in most of servers since many pep farm money stayng staying there all day).
good lucky with the achivment