nyleve: Ill try to give you a simple history of black metal.
There are 3 kinds of black metal music (IMO).
1st: The 1st kind of black metal was very thrashy and heavy metal sounding, basically because it was taking its roots from them. Bands like Venom, Bathory, Hellhammer, Mayhem, etc were amongst the 1st generation of black metallers in the 80s and early 90s.
2nd: 'A Blaze In The Northern Sky' by Darkthrone is considered the 1st black metal album of the new era if I can say. It is very raw, simplistic, dark yet so effective in its own way. Darkthrone, along with Marduk, Burzum, Emperor and some others helped shape the new face of black metal.
3rd: Then theres the symphonic black metal bands: Cradle Of Filth, Dimmu Borgir, Old Mans Child etc. They are the more popular ones, because they are more accessible. The guitars are basically tremolo picking for the most part, sometimes with keyboards making up the symphonic part of the music.
So all in all, black metal is very dark, mostly raw with screeched vocals, fast drumming and guitar picking and underground.
And yes, Orchid has death and black metal influences in some ways: just the way they do the riffs in some songs.
But hell if you want death metal done by Mikeal, look no further then Bloodbath.