Dead Cells: Secret room in Ancient Sewers (Alchemic Carbine blueprint location)

Im once forgot you take dmg no matter how you go in and lost my 60 kill at 59
Pain

Imagine you bringing cursed sword

Can you find that item as a random drop before you find it in the secret room because I don't remember finding the blueprint and a secret room but I have used the the item before I just don't know if it's unlocked for me or not, And I remember that being a really cool crossbow but now that I'm thinking about it I did do one daily challenge thingy and I hope that's not where I found it

Is it available on 3bc?

Hey what skin is that? Looks cool as hell

What's the seed?

Thankyou.