Heart Demon

The energy flow went into my body far smoother than anything I've ever tried before. The whole experience was incredible. I could sense and understand the flow of Qi and how it 'should' move through my body. 

And what surprised me was the fact that this old man, not only did he have no knowledge of my Poison Path cultivation method and meridian pathing, he immediately understood and deduced them, then came up with a far more flexible and more optimal pathing method.

This way, if I wanted to use my Poison Qi to cultivate, I would have far less wasted rotations and will have my overall cultivation speed increase by at least a third.

That's an absurdly high amount of efficiency, and it comes at no costs.