Not Enough
"I had not spent enough time with my children, and so I now vanquish in this cold and empty hell," mutters the Fire Lord, as he knows that it is true.
He favored the prodigy – and the prodigy has "repaid" him by becoming a failure, an absolute nothing that does nothing and is valued as nothing.
He ignored the other, not-so-fortunate child – and that child is now wearing his crown, ruling the Fire Nation in his stead, after murdering the Fire Lord for the last possible reason.
"If only I knew back then what I know now," the dead Fire Lord Azulon mutters, and the chains forged from human malice rattle as he seethes in his post-mortem death.
End
