Madness
Ryu roared into the skies, unable to withstand the restructuring of his body in silence.
The Rite of Limitations earned its namesake for a reason. This Rite was meant to push past what one's innate talent was capable of. Although the Heavens seem to be unfair, gifting some talent and ignoring those without, this isn't entirely the case. There are many stories of those with poor talent ascending to the top of the martial world purely through their own perseverance.
Why was it that one's Mental Realm was so important? It wasn't just that cultivators must live for a long time and thus must have strong Spiritual Qi in order to not lose themselves to madness, it was also because one's mentality in cultivation was incredibly important.