Quote:
原理血戒
Idea Blood. The quality of the blood that makes the Ancestors what they are, and a foundational commandment etched on their soul.
The dead apostles who inherited this blood would always rise up to become Ancestors no matter their rank; Arcueid compared it to a "crown".
On the other hand, a millennium-class foundation is needed for the 原理血戒 to function, and even if a dead apostle with hundreds of years of activity were to inherit it they would be crushed by that curse. Properly speaking it was not something that Vlov could withstand, but thanks to a technique given to him by a certain dead apostle as well as his desire for revenge against that person he managed to retain his sanity until the end.
come up with some chuuni rendition of 原理血戒 on your own, it's 4 am and I can't be bothered. this is the "principle" from the 27 DAA entry