Who's the real monster.

Harry is captured by Voldemort, and after months of being under his 'tender love and care', Harry finds himself placed under a ritual. One that turns him into the darkest creature known to the wizarding world. A creature that hadn't been seen by the wizarding world for centuries. What happens when those Harry refused to betray turn their back on him? What happens when the demonic powers he doesn't know about activate and warp him to a whole new world? Will the now betrayed, near broken, Harry, with powers he has no idea about let alone know how to control, find a place for himself? Or has his last straw finally broken? Harry potter crossover with Inuyasha