Senja Castle Quest/Spoiler

Required equipment

 * Destroy Field runes (1 charge required, 15 charges (5 runes) if you want to avoid damage)

Method
Image:Senja_Castle_Quest.jpg
 * Head to the Senja Castle and enter the basement (here).
 * Here you will find tons of different kinds of fields, walk through or use destroy fields on them to the marked field on the image below. Use a Destroy Field on that fire field and pull the switch under it. Then head through the door in the north part of the room.
 * Continue north and into the portal which will teleport you to the quest boxes.
 * Entering the portal in the quest box-room will take you to the roof of the castle.