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.
Christoph "Wolf" Lindemann - vocals, guitar
Christoph "Tiger" Bartelt - drums
Simon "Dragon" Bouteloup - bass
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. Read more on Last.fm