Potentiam are a unique black metal band from Iceland, formed in 1997. They evolved from the band Thule with members of Curse, Fortid and several others. They have had several lineup problems at different stages, eg finding a black metal drummer on an island as small as Iceland.
Their music is very unique, the Bálsýn debut is stylistically most similar to In the Woods... - HEart of Ages, but similarities can be found with more progressive black metal acts such as Enslaved or Weakling. The guitar work is superb and intricate, deeply atmospheric. The vocals are not typical for black metal at all, more like a hoarse viking chant. Use of keyboards and other instruments is also well placed for atmosphere and power. A very unique band, and therefore under-appreciated by the general black metal community.

The official site can be found at:
http://www.potentiam.helviti.com/