When you tried to kill a monster somewhere in the Glast Heim either an Injustice, you probably get an item called Blood Gem, this item is only use for Knight, Lord Knight and Rune Knight. However, this is so far the most expensive quest that you need to pay more than 6,000,000 zeny to complete.
Blood Gem is a usable item and once you Accept or use it. It will require you to pay to an NPC for 200,000 Zeny to the initiate the quest, the name of the quest is Knight Soul – Shadow. The required level to use this item is level 80.
In the next part of the mission, an Sword Soul in the left corner side of Glast Heim asked you for 5 x Mastela to proceed and after that it will asked you again 5 x Rose Quartz.
This is an ongoing article, We have no info yet if this quest is really worth it, what rewards you’ll get or unlock after doing the quest. Keep visiting the site for updates!