How did it feel to suddenly grow a new limb much less a new organ that until now never existed? Well, the feeling was definitely not pleasant.
Although at first Nash felt nothing except for a little tingling sensation, the moment he channeled his essence through all his five Primordial Veins and watched as his second heart became more and more visible, a piercing pain grew in his chest as if a thousand needles have gotten stabbed into him!
As a reason, Nash was forced several times to stop his cultivation and rest as he was unable to resist the pain. There were even moments where he pushed himself through his limit only to end up with his mouth full of blood and his body lying on the ground!
'Small gate my ass! This is like torture!' Nash cursed in his heart as he sat up and began to cultivate once again.