No, it's not Cradle of Filth (nor Children of Bodom, or Dimmu Borgir, or Graveworm and definitely not Iron Maiden) neither is it from Symphony of the Night. It's not from any Castlevania OST. Konami basically hired some guy to make metal covers of Castlevania music in 90's and this is one song from the album.
I actually remember the original video someone did for this as a cover of Bloody Tears with the guy playing guitar in his room. I want to say the video is around 2008-2009 or possibly as early as 2007. I tried to look for it a while back but couldn't find it and others have done their versions of Bloody Tears also. There was another person who did a thing called Castlevania Stages 1 3 and 5 and it included singing. I couldn't find that video either.
castlevania - Bloody Tears This is one of the most covered video game tunes I've come across but this is from one of the promo soundtracks put out a while back, I think this one dates back to the mid or early 90's
It's song is called "Bloody tears" is the castlevania's 2 simon's quest principal song, serach here in the page Bloody tears neogeofanatic and you will hear a real guitarrsit and a REAL INSTRUMENTAL SONG
We've been learning Gothics in English and Castlevania has been in my mind the whole time! Since I am a fan of metal and gothic writing, it wasn't hard for me to find this badass song! If you need me Imma go kill Dracula now!
If you're interested in a deeper "Doom Metal" sound with Gothic influence, check out VENI DOMINE on MetalCrossTV, I think you might like it. Long live Swedish Doom Metal! MetalCrossTV