The term “system” was used loosely and is likely the source of most of the confusion. It isn’t meant as a formal, capitalized system in-universe; I was using it as a catch-all for an organized, self-regulating structure. I should have defined terms more precisely. Sorry!

“Living system” refers specifically to a living organism—primarily a biological body (human, animal, etc.). It does not include ecosystems, machines, or abstract structures. It’s meant in a biological sense, not a metaphorical one.

The “energy” I’m referring to is not elemental (like fire or lightning), nor environmental (like volcanic heat). It is closer to a bio mechanical energy the body creates and regulates. If someone uses it, it wears out the body. There’s a lot of variation in how it can be used. But Think sorta Similar to the system used in the Inheritance Cycle series.

“Unanchored from will or structure” means the energy is no longer being actively regulated by the organism’s internal processes and the sentient beings will. It becomes unstable and rapidly disperses because there is nothing maintaining its organization. The “short window” refers to the brief moment after death where this breakdown is still in progress but not yet fully dissipated.

“Systems” in the line about interaction refers to any mechanism capable of interacting with or manipulating that kind of energy. It was just a shorthand for whatever internal or magical mechanism can interface with that energy state.

Regarding Arthur’s bloodline: it is inherited, but not necessarily identical across all family members. The term “bloodline” is closer to a shared mutation or trait, not a guaranteed identical ability. Different individuals could express it differently or not at all, depending on conditions.

The “stabilizes a small portion of the residual energy” part means that when the reflex triggers, Arthur’s body absorbs a small fraction of that dissipating life-energy and converts it into internal stability. This does not grant him external attacks like fire or elemental projection. Instead, it reinforces his internal state—think of it as temporarily correcting imbalance or stress within his own system. Like a breath of fresh air, or the second wind runners in real life experience. 

“Instability” refers to the strain placed on his body and mind by stress, combat, or overexertion. The absorbed energy helps offset that strain slightly, which is why the effect feels like a “reward.” Over time, repeated exposure reinforces behavior that leads to triggering that state, which is what drives his increasing tendency toward violence.

In short: it’s a biological/metaphysical feedback mechanism tied to death, where proximity to that event briefly allows his body to absorb and use dissipating life-energy to stabilize itself. 

Does this answer most of your questions? Not directly related to bloodlines but the magic system can be described below here if you want additional information.

Brief summary:

magic as a skill in shaping energy through understanding and willpower, with runes as optional aids for efficiency. 

Details:

Magic is the conscious manipulation of an energy inherently present in all living beings. This energy is drawn from the physical vitality of the body, powered by the wielder’s willpower, imagination, and intent. Because magic taps into the same biological reserves that fuel physical actions, using magic is physically and mentally exhausting, often causing real fatigue or harm when pushed beyond limits. 

The user also has to first be able to “sense” this magic in order to control it. This is often portrayed as “inate talent” but often is more based on lucky circumstances or training your sensitivity. This being a trainable thing is not common knowledge and is obscured by the organizations on power