Spoilers Thread! (During release window)

I managed to get to Inferno Caves early using the maxed out Reflector Ray shard ability. I ended up fighting the bosses in reverse and eventually got to a cutscene only...



...it doesn't trigger from the left side, so I can move around freely until I come in from the right to trigger the cutscene. More proof that sequence breaks are a no no in Bloodstained.

Step 1: Zangetsu will give you a paper charm shard after the train section, which prevents Alfred from escaping during the boss battle (must use it to successfully hit him). You can then talk to Johannes who will agree to meet with Alfred at a position where Dominique cannot follow you.
Step 2: Fight Zangetsu and he will still give the sword to you. Board the train and you will find the two Alchemist there as well, who will devise a plan to save Gebel.
Step 3: Go find O.D., who will claim he don't know if he wants to betray Gremory and test you. The boss fight ensues with the same difficulty as the Glacial Tomb one. Then Johannes will come in and spend a bit of time in the Library.
Step 4: Head back to the red moon room, where the three will set the trap for Gremory.
Step 5: Go fight Gebel, which then cause Gremory to appear. Slash her with Zangetsuto. Johnnes will remain here to tend to Gebel.
Step 6: Gremory will escape to the trap which you will be both sucked into the Den of Benemoth. You must fight a giant Gremory. Hopefully you have crafted High Jump.
Step 7: Dominique tries to sneak attack Alfred but was wounded by Zangetsu instead.
Step 8: Gremory uses her last breath to pull in a weakened Dominique into the Den of Benemoth, and a horde of giant demons are about to pour out, which you, recovered Gebel, Zangetsu and Alfred will repel.
Step 9: Alfred then heads back to the village with Johannes and scold him for inexperience. Many new recipes are opened up and Alhest costs significantly reduces. Gebel is also here resting.
Step 10: Chase Dominique through the Den of Benemoth into the Glacial Tomb. She will be used as a sacrifice and the fully powered Beal is summoned into this world, (a chamber directly below the centre of the Garden) and he is absolutely massive.
Step 11: You find a weakened Dominique, and only Johannes is willing to save her. However O.D. shows up and heal her. However, his real goal here is to recover the book Miriam didn't return, and said Demons do not enjoy being summoned against their will.
Step 12: The two Alchemists send the entire castle back, and Dominique survives but broken, both physically and mentally. Zangetsu reclaimed his sword and said he is going to mercy kill Dominique, but got stopped but the trio who had a change of heart.

Step 1: Get all shards before the fight with Gebel.

Step 2: Beat Gebel and have Gremory possess you.

Step 3 and beyond: Unlock a new mode where you control Gebel, Zangetsu,and Johannes and fight through the castle again to defeat Possessed Miriam. Just like in Dawn of Sorrows.

His HP changes to however much money you have after he absorbs it. I had 2 million+ money. Needless to say... the boss became impossible.