Tooth and Claw

Him and his mate, claws as sharp as dog's teeth. His claws were red from the blood of his enemies, his pelt was always covered with blood, never his own. Bloodshed was his pleasure, always being spilled time and time again until it had seeped so much into him, his scent contained its reek. Every moon it seems his eyes get redder, more possessed with the demon around him. The demon was unimaginable, unbearable for me to even think of. Her name was Deathheart...

She was his mate, ten times worse than him and the rest of BloodClan. Her once-white pelt was blood-red and her eyes always glimmered with hatred and a thirst for battle. When someone didn't agree with her, she killed them instantly, without looking back.