As is the case with several quest lines within OSRS, you will need to complete some quests to gain access to others. This is the case when it comes to Regicide. For some, you will need to get to a certain point in the adventure. Whereas with others, you will need to fully complete this quest. Here is a quick list of all the quests that are directly linked to your progress through Regicide: Roving Elves Mournings End Part I Mournings End Part II Song of the Elves