If I'm right, the DC should be 2 lower, giving us
This is right.
Anyways, I think I will keep the vote going till tomorrow and then start working away at the next section.
Honestly, the Guang's entire thing seems to have its origins in having really shady and sinister techniques that over time got converted to still kinda shady but not necessarily evil techniques, considering our Bloodline started out with people murdering their relatives for power.
Your bloodline didn't actually start with murdering people (that came later) originally, they were an offshoot of a minor bloodline of mediums which traveled around as exorcists and psychics helping both the living and the dead achieve peace by communicating last words and requests.
I haven't really decided yet if this was just a random mutation, or a purposeful act but it has little effect on our current times.
Technically (very technically) the Guang haven't lost the ability to channel none blood line members but they do need access to knowledge and techniques to attempt such and its not as natural and instinctual as channeling their ancestors, for most at least some of the more minor branches of the line kept that particular ability a lot better than others but this is correct for most Guang (or was seeing most if not all of them are dead).
Strengthening this aspect through bloodline thickening is very much a possibility.
The blood spilling cycle is actually a product of the third demonic war about four thousand to four thousand five hundred years ago.
For some context, many a technique and cultivator is labeled a demonic for a verity of reasons and the line can blur based on your reputation (no one would dare accuse infinite mountain of demonic practices despite the fact that the only difference in their flesh crafting is that they tack righteous in front of it and aren't using it on mortals) but most demonic cultivators aren't true demons, they are just ruthless cultivators which use corrupting techniques and or harvest mortals/their fellow cultivators for personal gain or pleasure.
Ture demons are terrifying and the rise of one is almost always the prelude to a new demonic war, where the entire righteous world bands together to just barely beat up the demon.
So the powers that be work tirelessly to suppress any hint of true demonic power before it's too late.
This happens for a few reasons.
Ture demons harvest not only the blood but the energy of death accrued from the act as well as the very soul itself. All three (but especially the latter) are powerful sources of energy, allowing the demon to not only advance in a fraction of the time but advance with a base surpassing their righteous counterparts.
Their lack of regard for the lives of others (or the demon own mental facilities) meant that using dark and corruptive arts as long as they stacked the pile of bodies high enough they could cultivate their souls without limit. They would go batshit insane and at a certain point they would be more beast than man but they could do so (and generally once started will continue down that path uncaring or unknowing of the dangers).
For context NS cultivators naturally reach soul grade 15, the Guang method can bring you to grade 9 (this stacks with the natural progression in NS).
A demon NS on average sat at around soul grade 50 and their geniuses (the ones who could manage to not go insane and suicide their life away) could go as high as 100.
Very scary and very powerful.
At the time of the third (and currently last) demonic war the Guang were minor power and on the lower end of that spectrum, their nascent soul was new (relatively) and while they still possessed a lot of knowledge about the lower realms their grasp of it wasn't what it would be four thousand years later when they were counted as part of the great powers.
Worse, they did not have the numbers they possessed in the future, the blood spilling cycle (and most of your special blood refinements) were developed because the Guang found that ensuring enough new cultivators advanced to replaces loses was beyond their resources, they were losing too much too fast and while that meant many more ghosts were floating around helping out it just wasn't enough when generations of Guangs were just hallowed out by the total war consuming the continent.
So they instead of destroying some of the manuals and demonic techniques that managed to loot in battle with the demons the looked them over, compared and contrasted removed anything that has to do with death and the soul and used their vast knowledge base to negate the corruptive influences and made a technique that allowed their members to semi safely (later refinements allowed this to be safely) to advance through combat (the art doesn't require killing, its just that if you're spilling enough blood to be sufficient to be noted your likely killing someone) and took that energy and invested it into special refinements which only purpose was war.
And I hope you enjoyed another installment of "background information that lived rent free in my head but that isn't going to be useful in the present".