I almost feel bad for not writing a legit description in my own words, but I'm just not feelin' it right now. So next best thing is to just give you the write up off of Southern Lord records' site. Besides, if you are into black metal, you should already know about these guys and their unique approach to the genre, combining a traditional black metal sound with shoegaze and lots of atmosphere with an eye toward eco-conscious themes.
From Southern Lord:
"During the Summer of 2002 at an Earth First rendezvous in the Cascade  Mountains of Washington State, guitarist Nathan Weaver was inspired to  create a band that merged a Cascadian eco-spiritual awareness with the  misanthropic Norwegian eruptions of the 90's.  The band envisioned would  strive to create a mythic space where artist and listener alike could  strip away the mindset of the mundane to reveal a more ancient and  transcendent consciousness.  The mysterious and wild energies of the  untrammeled forests of the Northwest would be channeled into sonic form. 
 
In the Spring of 2004, Nathan and his brother, drummer Aaron Weaver,  moved to a dilapidated farmstead on the outskirts of Olympia, WA.  The  creation of their farm-stronghold, called Calliope, would be  intrinsically linked to the development of Wolves in the Throne Room.   It was during the first long, dark winter living in the collapsed  farmhouse at Calliope that the band developed their trance-inducing  sound and solidified the burning intent that would animate the band's  music.  Elements of black metal, crust punk, folk music, thrash metal  and drone music were drawn upon to create a unique alchemy.
 
Since that time Wolves in the Throne Room have ascended to the upper  tiers of the underground scene by creating a transformative and  apocalyptic musical manifestation that has come to completely transcend  the black metal label.
 
Wolves in the Throne Room's first studio album, the lush and  atmospheric Diadem of 12 Stars (A Shimmering Radiance), was released in  the Spring of 2006.  This gloriously sprawling record was captured on  tape by Tim Green at Louder Studios in San Francisco.  Diadem was very  well received and quickly established a cult following.  Wolves in the  Throne Room was heralded by the press as one of the most promising Black  Metal bands to emerge from the United States, though the band stressed  in interviews that they felt like they had little in common with their  more Satanic peers.
 
The fall of 2006 brought a new pact with Southern Lord records and  the beginning of a relationship with producer-engineer Randall Dunn.  (SUNN O))), Earth, Grails)  Their epic album Two Hunters is a  masterfully dark and emotional document that further established Wolves  in the Throne Room as a band totally unafraid to follow their own path. 
In January they will release a European tour-only EP picture  disk, titled Malevolent Grain, on Conspiracy Records.  The record is the  first to feature their new guitar player Will Lindsay (Middian) who had  previously served as the band's touring bass player. 
 
Winter Solstice 2008 saw the completion of their 3rd studio album,  cryptically titled Black Cascade.  Recorded onto 2 inch tape and mixed  on a 1973 Neve Console by Producer Randall Dunn, this monolith of trance  inducing psychedelia swings between passages of blazing crystalline  blackness and ocean-deep ritualistic dronescapes.  Black Cascade  elevates Wolves in the Throne Room into the ranks of the elite in the  extreme music world."