This article's content is accurate to the most recent public game version, 0.4.8d.
"Black bunnies swarm the enemy, attacking two random targets twice each."
Cost: 4 
Source: Catherine (starting skill)
Schwarzes Kriegsgerat is a bunny skill that only Catherine can use. Using it deals two bouts of light 
Blunt damage to two targets chosen at random.
Trivia
Schwarzes Kriegsgerat, like all of Catherine's moves, is made out of garbled German, which translates to Black War Machine. It should also be written Gerät with an umlaut.