ExperienceRO's custom storyline uses the in-game Quest feature extensively. It is highly advisable that you enable the "Quest Notification" at the "Quest Window" (alt + U).
There are two kinds of Custom MVP spawned - One time based, and the other one spawned depending on monster kills on/in that dungeon(s) and carries the "[ Custom_MVP_Name_Here ]" brackets. Only the one that was spawned based on monster kills will reward you with the necessary Quest Marker(s) so that you can progress to the next Chapter.
CHAPTER 7: CHAOS UPRISING
Chapter 6: Chaos Uprising (Complete)
Cursed Monster Kills: 14
Reject "The Order" offer by Valkyrie
Chapther 7 introduces "The Chaos", which is the opposite and of course, the enemy of "The Order". "The Order" represents Holy, led by Odin whereas "The Chaos" which represents Evil, is led by Hel. Odin sends Valkyrie as his messenger, Hel sends the Iron Maiden as her messenger.
The Chaos: You pledge to serve Hel and offers her sacrifices in term of Human Skulls (Skulls obtained in WoE).
The Order: "Evil days are upon us!" says Valkyrie. She sends you to investigate the source of this evil.
Side Plot: The Sunken City was once ruled by Amphitrite who has a very close link to "Jewels of the Sea".
QUEST TIME LIMIT
Mini-Boss: Evil Spirit
Mini-Boss: Royal Guard