Wallpray is a bug that i hate, but i will write it for the few who doesnt know what it does. It is a way to take the castle of antoher clan on a siege, without getting in the artifact room (To do it u must be clan leader) . First destroy the gate or a wall with ur clan. Enter the castle area. Then u dont need to enter the throne or the artifact room. Press /target and the name of the artifact (according to the castle u attack). and press the skill "pray" (or something). When u manage to complete the skill the castle is all yours! (to defend it)
I remind u that I hate it because this way, I have lost a castle many times
IT WORKS ON EVERY L2j SERVER WITHOUT CUSTOMIZED GEAODATA