There are multiple artists with this name:

1) Kadavar is a progressive / hard / psychedelic rock band from Berlin, Germany. The play a sort of retro rock / proto-metal with occult themes.

Current line-up:
Christoph "Wolf" Lindemann - vocals, guitar
Christoph "Tiger" Bartelt - drums
Simon "Dragon" Bouteloup - bass

Former members:
Philipp "Mammut" Lippitz - bass

2) Kadavar is an old school death metal band formed in 2007 from Milan, Italy. The band managed to release a demo, EP, and a full length before disbanding in 2009. Before adopting the name Kadavar, the band was known by the name Bleeding Eyes. The Kadavar LP line-up was:

Current line-up:
Lorenzo "Evil Jeff" Bidoli - Vocals, Rhythm Guitar
Luca Braggion - Lead Guitar
Luca Colucci - Bass, Vocals
Davide Bacchetta - Drums