** About the Final Battle, and my feelings (perspectives) **
[Already made a comment about this, but was requested by insideout91 to add to this thread, so here it is]
For me personally, I actually really like how the final battle was written.
Also, I personally, DON'T see TY is weak because he already killed FY physical body, but because FY "Dark Spirits" remains and cannot be destroyed, since FY is a manifestation of everyone's greed, anger, fear, ignorance, and unfulfilled desire, so as long as people carry these emotions, FY can never be completely destroyed. No matter, how much TY use his powers to destroy FY dark spirits/essence, it returns, it is just like a never-ending cycle, and TY has been battling it for DAYS, so it is only natural that his spiritual powers can be depleted by then (since all spiritual powers is not limitless and we can also take into an account that his HPS and Neidan is inside YH still).
This is why I love how the writers have YH be the one to END FY Spirits/Dark Spirits by refining the HPS(inside her) into the "Yang Energy" (which associates to Tian Yao's spiritual dragon powers), since her Ghosty Eulogy she cultivated was based on the "Yin Energy" that ties to FY, and because FY (being Yin) and TY(being "Yang") their powers counters each other, when YH refined it to the "Yang" energy (that associates to TY's spiritual powers), that was the key to truly destroying FY once and for all which Xue Lin did not accomplish. Also, after doing so, YH and TY powers no longer counters each other. Which I am so glad on my end because she no longer need to rely on BXS cloak to be able to touch TY again after this.
While it came at the expense of her giving up her "life", but she managed to come back in the end. I just love how TY was the one to destroy FY physical body, and YH was the one who completely finish FY off on her end (as it shows them to be a POWER CP) that works together to defeat FY (as one!)
Also, in the final battle, when TY return to his Dragon Form was a parallel to the beginning when he was laying there T_T At the beginning TY only have those elves that sacrificed to try and protect him, but now, after coming through a long/adventurous journey, he has met a lot of friends a long the way, one's that will help him and also stand by his side. He no longer have to do it all alone, but he's got friends [It's the whole beginning vs ending parallel that I love]. Not to mention YH and TY love for each other remains strong to the end.
Normally, I don't like the message behind the Male Character originally have black hair turned white, because it is usually the typical "Losing one's power or the life-span is shortened etc"... For TY, the message why his hair becomes white was a symbolic/revelation to his grief in losing YH in the final battle was so beautiful that I can't help but love it even more!!!