Yes, This is Actually in the Game | Witcher 3 : Wild Hunt 

This easter egg humt going back and forth from "Witcher series's and cyberpunk 2077 and the type of way its portrayed to the player gives a cicada 3301 puzzle vibe. Both use tunes to convert into cryptic number puzzles and they both use king arthur references. But idk. So much mental gymnastics for this specific easter egg. Happy egg hunting everyone

Use yrden! Catch they with yrden!

Yeah this is related to Cyberpunk 2077 of all things :D

Its posible arad with cold piercing or your companion can kill them problem is next step i wonder if there other ways to light up thous 2 crystals or mebye there is a 3rd

I dont know if its true but if u do this before finding ciri u get a new dialogue regarding metal head world(cyberpunk I mean) i didn't try this but my friend told me he got something new dialogue or such Idk if this is true and dont wanna test cause not played the game since next gen but u can try if u find something

There's actually a way to het out there's 2 crystals on opposite its in the last room. just use aard on them, and a portal will open.

I don't get it. So it's just a trap or what?

Wait.. what's that behind in the end ? I think I ve seen that tree like thing before

Cool armour.

is this only possible in PC-Version? or is it also in Play-Station Version?

Part of cyberpunk 2077 easter egg

But not available for ps4😢😢😢..

Yooo what the actualy fuck xD What why how xD It is a good thing I literally started a new game three days ago!

How does he run so fast ?

i go ther and geralt say that yen well help

Is there in 1.32/Classic version?

Gigantic scumbag move by those POS at CDPR to screw PS4 players over with this!! Lost every ounce of respect for them a long time ago.