Chapter 7: Chaos Uprising is the latest chapter in the Storyline. Just like the rest of the chapters, it features new and challenging quests for players to complete, but this time, there's a new exclusive ExperienceRO map introduced: Helheim.
There are also two new bosses (not Chapter MvPs): Evil Spirit and Royal Guard. Chapter 7 also introduces new pets (Punching Bag, The Boss, and Royal Guard), the new Curse feature, and new gem grades.
Chapter Plot
Chapter 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 Wish 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".
Petra: Meet the Underworld Guardian
If you've joined The Chaos, Wish Maiden will send you to Petra, who'll tell you to find the Guardian of the Underworld who can grant you approval to access Hell.
If you've joined The Order, you cannot access the Portal. Instead, the spirit of the portal will mock you, sending you an a quest to kill Evil Spirit. Only after killing the Evil Spirit will the Portal grant you access.
Old Woman: Hell's Not Talking
Talk to the Old Woman outside the gates of Hell to find out that she speaks both Dark Tongue and English. Asking her how she does so will have her reveal more about the ancient language.
She will send you to Abel, who is well-read and studies languages in Vanadis.
Abel: Dark Tongue - Language of the Underworld
Talking to Abel, he'll offer you the knowledge of Dark Tongue if you were to bring him some items on his request. Once you do so, Dark Tongue will be learnt. Then, you'll be able to talk to all the NPCs in Hell, or else they'll talk to you in a mysterious language you will not understand.
For The Order, the 'knowledge' of the portal is only revealed when you have hit 14 Cursed MvP kills. Valkyrie will send you to 'investigate' Niflheim.
Tomb: Skull Sacrifice
After the Dark Tongue is learnt, for The Chaos, you now serve Hel and she loves Skull sacrifices.
There are altars in the middle of Hell that accepts the Skulls. Every type of skull carries a basic value, and every time you talk to the Altars, you'll be given a different 'multiplier' to your skulls (there are times you get more skull points, there are times you get fewer).
Now the skull points you get from this are accumulated and will 'empower' your 'The Chaos' emblem or seal, Different levels mean different accumulated ability.
As for 'The Order', skull features will be coming sooon.
Optional: Abel - Amphitrite's Jewels
At any point one has completed 30 Temple Runs, one can talk to Abel about the "Jewels of the Sea" (Grade 8-10 gemstones)
Since Abel is well read, he tries to look through his history books about the Jewels and he is able to identify them as Amphitrite's Jewels, the wife of Poseidon, who used to rule The Sunken City into an era of overflowing prosperity.
Abel suggests that the secret to these Jewels sunk with the City and suggests you to have a look around the statues in the City since they built these statues as a symbol of respect and allegiance to Amphitrite.
You'll find 4 clues around the statue in the middle of the City and you'll be hinted to look for the 'upper room' which is just above from where you spawn entering the City.
You'll go down a path with leads you to a spiral of stairs that's guarded by 2 Royal Guards before the stairs end with a portal to Amphitrite's Sanctum (a huge library).
Optional: Abel - Useless Book!
Once you reach Amphitrite's Sanctum, head North and you'll recover a huge book (Amphitrite's Journal or some sort) which you'll conveniently bring it back to Abel, since you do not understand what's written on it, and he'll ask you to leave the book with him to study for a week.
Optional - Abel - Gem Cutting Books
After studying the book, Abel tells you that he can make/replicate these higher "Gem Cutting Books" if you could gather him the materials. There you go unlocking the quest to make higher grade gem cutting books.