Locked door in the castle (top left)

[Puzych]

So I collected everything that was marked on the castle map except that door, so I wondered how to open it? It seems that you have to approach it with Richter. Fine i thought, and...:
How to get Richter? Evolve guardians targe.
How to get targe? Unlock Maria.
How to get Maria? Complete with Juste AND Shanoa.
How to get Juste? Evolve wind whip.
Hiw to get Wind Whip? Unlock Simon.
How to get Simon? Evolve Jet black whip.
Where this jet black whip? Get Christopher.
Where is Chris? Evolve Alucards Sworb.
Wtf is that?
Where....

Are you serious? Is that the way for that freakin door where large portion of the castle content is hidden?!

[Peachwise⛧]

Keep playing, you need to keep finishing achievements and then you will kill more new bosses and then you unlock. There's more hidden stuff.

[Moonbane]

Originally posted by Puzych:

So I collected everything that was marked on the castle map except that door, so I wondered how to open it? It seems that you have to approach it with Richter. Fine i thought, and...:
How to get Richter? Evolve guardians targe.
How to get targe? Unlock Maria.
How to get Maria? Complete with Juste AND Shanoa.
How to get Juste? Evolve wind whip.
Hiw to get Wind Whip? Unlock Simon.
How to get Simon? Evolve Jet black whip.
Where this jet black whip? Get Christopher.
Where is Chris? Evolve Alucards Sworb.
Wtf is that?
Where....

Are you serious? Is that the way for that freakin door where large portion of the castle content is hidden?!

And that is about the halfway point of the DLC. You are quite overreacting. For once the DLC contest lasted remarkably longer.

https://vampire-survivors.fandom.com/wiki/Alucart_Sworb