Oleg Stark

Oleg Stark is an extremely rare Ogre-like Wesen called a Seigbarste with dense bones, thick skin and a high tolerance for pain, making them nearly impossible to kill, they are incredibly strong creatures, much stronger than Grimms or other Wesen, and able to easily overpower humans, Grimms or Wesen. According to Monroe they are the worst of all Wesen, and are durable enough to stop a train, they are however not invulnerable, and certain things, such as bullets from a hand gun or boiling water can damage and hurt them, but not kill or do enough damage to stop them.They are notorious for holding grudges and won't rest until they get their revenge. While not impossible to kill, high-powered elephant guns known as Siegbarste Gewehr with bullets coated in Siegbarste Gift (poison) are the only way to properly kill this creature, although Monroe states it is possible to kill them with significant force, although the chances of doing so are incredibly unlikely. The poison calcifies the bones, essentially shattering the whole Ogre from inside out.