What I wanted to talk about, though, is this. Blood masters have tiers to their power levels. For the most part, these scales are relative, not absolute. A blood master can progress through the tiers with training and experience, even though most blood masters peak at around the fourth tier. These tiers are:
-Tier 1: the blood master is only capable of using blood magic when they are gravely injured and in a dire emergency. However, they hold an instinctive mastery of their great blood loss so strong that they can pretty much instantly resolve any problem they are placed into.
-Tier 2: the blood master is able to deliberately use their power, by inflicting bodily harm on themselves. However, their process is inefficient, using up a lot of blood, and generally requires an object to channel their powers through. (Thus, why blood master clans all have a signature weapon: it's what they used to train.)
-Tier 3: the blood master is able to use their power by inflicting bodily harm on themselves, and has now refined it to be efficient when using their focus object. However, they can't use it without an object, and when not using their preferred object, it's still inefficient.
-Tier 4: the blood master is able to use their power by inflicting bodily harm on themselves, and has now lost the requirement of having an object to focus their powers through. While focusing through objects can help channel their powers more effectively, especially the weapon they're most proficient in, it's not more efficient, just more comfortable and easy to manipulate.
-Tier 5: the blood master no longer needs to inflict bodily harm on themselves, able to directly draw their blood from their system and use it.
-Tier 6: the blood master gains the ability to manipulate spilled blood that is not their own.
-Tier 7: the blood master gains mastery of all blood.
-Tier 8: the blood master can separate out the elements in blood and divide them out to control them, even though they are no longer in the form of blood, because they used to be in the form of blood.
Each of these tiers also grants a gradual power increase. Around tier 4, blood masters begin to gain resistance to the prime elements based on blood. Around tier 5, blood masters begin to be able to more directly influence objects, like, say, sending blood into the ground and having it form a gigantic wall of earth. Around tier 7, the blood master is at peak levels; it is called the grandmaster level, even though you don't necessarily need to be at this level to be a grandmaster and being at this level doesn't mean you are a grandmaster.
Tier 8 is extremely rare, and is basically the ability to manipulate reality, altering and changing it with their will. Blood masters of this tier have existed, but are pretty much considered legends, because it is, quite literally, god-tiered power. It's rumored that the blood masters who achieve this level of power can't maintain their power in mortal form forever, and thus, ascend to godhood.
Different clans have different standards for who can be a grandmaster. For instance, the clan using sword-and-shield has its roots in the common footsoldier. They weren't even originally blood masters, and for the longest time were primarily first-generation users. (Even after a hundred years had passed.) As a result, their standard isn't based off of tier, but rather, a combination of leadership, skill, experience, wisdom, intelligence, and attitude, with the person chosen as a grandmaster theoretically being able to be a tier two blood master. (Most end up being tier 4 or so.)
In contrast, more difficult styles like the dagger/whip and drill styles generally require at least a tier 4 or tier 5 in order to be a grandmaster, simply because their style is elite and tradition dictates that only the finest of them would be able to lead. Both spear clans require tier six, mainly because grandmasters of their clans are expected to traditionally be among the strongest. And the bow-and-sword clan never has a grandmaster below tier 7, because traditionally, their first grandmaster was one of the first tier 7 blood masters, and every grandmaster to follow him has also therefore been a tier 7.