Dusk Diver 2

Story-related and cannot be missed.

Chapter Unlocks: New max Orb Synthesis level & recipe: Common Orb (level 3).
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This trophy is for completing Chapter 6, "Masquerade Party", which is one of the longest Chapters, as the story has quite a lot to do and places to visit, and several new, unique mechanics.

Your very first objective in the main quest is to visit Dadaocheng. Once you arrive there and complete that objective, the next step is to visit the theater next door, but, as the game warns you, "once you enter the theater, free exploration will be unavailable for a while." Once you enter, you won't be able to do any side quests or anything else until the end of this Chapter, because the game will automatically take you from place to place for the remainder of Chapter 6. Because of that, it's strongly recommended to complete all new available side quests first, before you begin the main story.

Among the several new side quests that unlock here, the most important ones are Bahet's and Nemea's Companion Quests. Like the previous ones you did, completing Bahet's "Bahet's Problem 1" quest will reward you with a new equippable Special Attack () for Yumo.
 

For this Chapter, you will go from Dadaocheng's theater, straight to Hesperia's headquarters in Climax 508 for the party. So far, the entire Chapter has been all story, no fight. After the party however, you will go straight to the SCCP Underground Passage.

SCCP UNDERGROUND PASSAGE: THE TRAP MAZE
This part of the quest can be a major headache. Depending on whether you're following a guide, or whether you are able to quickly understand the pattern, this level can turn into a total mess. The SCCP Underground Passage contains a maze, otherwise known as "The Trap". If you understand the trick however, you shouldn't have a problem.

As you are going through the maze (with no mini-map, mind you), you'll notice that in each room, there will be four small statues of the mini Chaos Beasts. Each statue will be facing a specific side. You need to pay attention to the direction they're facing to navigate the maze. Essentially, look for the two statues that are facing the same direction. That tells you to go in the direction they are facing.

If the two statues on the same side of the wall are facing the same direction, then you should go through the entrance that's on the same wall as them. So if both statues are on the North-side on the left, then you go straight through the north-west door. If the two similar-facing statues are on opposite walls, you go in the direction they are facing. It's as simple as that.

However, you're going to want to get all the collectibles, too. The only way to do this is to know when to follow the statues and when to go against the maze, to force it into a different part of the maze to get the other items. If that room you enter has an item, it will be dead in the center, in between all 4 statues.
 

(Click the images to enlarge.)

SCCP CONTROL AREA & BOSS FIGHT: RAVEN
Once you escape the maze and reach the end of this area, you will move to yet another location; the SCCP Control Area. 

The SCCP Control Area also has its own mechanic: Anomalous Phase Rifts. As you proceed, you'll run into a building with a red haze, which you discover is some kind of reverse Dragon Vein energy. To be able to continue, you're going to have to find a way to clear that negative energy out. On your mini-map, you will see small green icons spread around the area. Those are "Anomalous Phase Rifts", which you'll have to close to be able to cleanse the energy. Cleansing these rifts is basically the same thing as how you would close fissures; enter the rift and destroy the Chaos Beasts within.

At the end of the SCCP Control Area, you'll face this Chapter's final boss: Raven. She is definitely one of the tougher bosses in the game, as she wields her flaming chainsaws with great skill. She can do a lot of damage if you aren't quick on your feet. Thankfully, her heavy weapon means she's a bit slower, but she's still a big threat.

Most of her attacks contain some kind of fire and explosions, so you're going to want to watch out for that. If you're too close to her, you'll get hit much more often. Try to keep a relatively decent distance in between attacks, which will help you to dodge her moves. Using Bahet's scythe attack Cyclone Slash, which has a longer range, and Yumo's Lightning Kick, which stuns enemies briefly and interrupts their attacks, can be helpful.

Once you get her down to 1/3rd health, the fight ends, as does the Chapter.