He did not try to use it immediately. This was important. The temptation — once he had confirmed that healing magic existed in him, real and accessible if not yet strong — was to go straight to Lyra, to apply what he had just found to the problem he had found it for.
He resisted this with the deliberate patience of someone who has learned, through experience, that applying an unrefined tool to a delicate problem is one of the more reliable ways to make the delicate problem worse.
He needed to understand what he had before he used it. He needed to build the instrument before he trusted it with the thing that mattered most.
The next morning — or more accurately the next dark-before-dawn, since the household was still asleep and he had not slept at all — he assembled the conditions for a first experiment.
The subject was a Bark Lizard. He had selected this species not by accident but by a careful evaluation of the options available to him: creatures that Shadow could approach without triggering defensive behavior, that had injuries naturally available for study without him needing to create them, that were small enough that a failed experiment would not produce consequences beyond the immediate subject, and that were common enough in his mapped territory that losing a specimen to an unsuccessful attempt would not meaningfully affect the local population.
The Bark Lizards under the fallen oak had a territorial structure that generated regular disputes, and disputes generated injuries. He had Shadow wait at the territory's edge for a natural opportunity rather than forcing one, which was both ethically preferable and practically smarter — a lizard with an injury from a territorial fight was a lizard in its normal post-fight state, not a lizard stressed by handling or sudden captivity, which meant his experimental variables were cleaner.
Twenty minutes after Shadow arrived at the observation position, a candidate presented itself: a mid-sized adult with a partial tail wound from what appeared to be a bite, still moving normally, the wound fresh enough to be actively bleeding in the small way that lizard wounds bled.
Shadow collected it and brought it to the research hollow.
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The Bark Lizard in Shadow's gentle dark-matter hold was approximately eight inches long and extremely displeased about its situation.
Arthur looked at it through Shadow's ember-eyes — the inverted vision that saw the lizard's small body heat as a dim shape and the texture of its scales as a pattern of light-and-shadow rather than color — and considered the geometry of what he was about to attempt.
The wound was at the base of the tail, roughly three inches from the body. The tail of a Bark Lizard was thick at the base and tapered, covered in the rough overlapping scales that gave the species its name, and the bite had gone deep enough to expose the paler tissue beneath the outer layer. He had seen dozens of these injuries in his months of observation. He knew what healthy healing looked like at various stages on this species — knew what this wound should look like in a day, a week, two weeks, and knew therefore what his intervention, if it worked at all, should be measurably accelerating.
He reached for the healing affinity.
It came more easily than the night before — not easily, but with a slightly shorter approach, as if the path to it had been worn enough by the first use to be marginally more accessible. He held it in the way he held magical constructs generally: with intention rather than with physical gesture, a mental architecture that specified what he wanted without requiring his body to do anything his body was not yet capable of.
Through Shadow he directed it toward the wound.
What happened next was not elegant.
The healing energy arrived at the wound site — he could feel this, the faint warm current making contact with damaged tissue — and then did approximately what a person who has never held a paintbrush might do on their first attempt with a brush: applied itself in an unfocused general way that was more enthusiasm than precision, warming the area broadly, stimulating something in the tissue that was definitely a healing response but was not a controlled or directed one.
The wound area flushed with the tissue-repair equivalent of being told 'do something' without being told what. The lizard made a sharp sound and pulled against Shadow's hold, which was the first sign that Arthur's intervention had registered on a sensory level — the wound was responding, something was happening, and it was at the moment not entirely comfortable.
He refined the focus. Pulled back the broad application and tried again with more precision, directing the healing energy specifically to the deepest part of the wound rather than the whole area, going in layers from the inside out the way, he had read once, actual wound healing worked biologically — deep tissue first, surface last, building from the structural inward outward.
The lizard calmed. The wound, under Shadow's direct observation, began to close.
Slowly. Clumsily. With the painstaking imprecision of someone doing something for the first time who can see the gap between what they are producing and what a skilled practitioner would produce but does not yet have the technique to close that gap. The tissue knit in an irregular sequence rather than the smooth progressive closure he would see when Healer Vance worked. The surface was uneven afterward — fully closed, fully sealed, but textured differently than the surrounding scales in a way that would fade over time but was presently visible.
It took three hours.
At the end of three hours he released the lizard and watched Shadow track it back to the territory boundary, where it disappeared under the oak roots with the offended speed of a creature that has had quite enough of today. The tail wound was closed. The lizard was moving normally. The experiment had, by the metric that mattered — healing had occurred — succeeded.
Arthur lay in his cradle and stared at the ceiling with the specific complex emotion of someone who has confirmed a capability they desperately needed to have and is simultaneously very aware of how far the current iteration of that capability falls short of what the application requires.
He could heal.
He could not yet heal well.
He had work to do.
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He approached the practice of healing magic the same way he had approached every other development in his magical life: methodically, with the specific patience of someone who had learned that shortcuts in foundational skills produced deficits that compounded downstream.
The first stage was volume. He healed things. Many things. Every Bark Lizard injury he could ethically intercept, the occasional Glimmer Rabbit that had a run-in with a territorial neighbor, the creatures at the edge of his hunting range that were injured but not mortally — he healed them with the steady focus of someone accumulating repetitions, and with each repetition the process became slightly more efficient, slightly more controlled, slightly more like what he was trying to do rather than a rough approximation of it.
He tracked his progress with the numerical precision he brought to everything that could be tracked numerically. Three hours for the first surface wound closure. Two hours and twenty minutes by the end of the first week. Ninety minutes at the end of the second week. Forty minutes. Twenty. He noted the rate of improvement, noted the apparent asymptote approaching in the low-single-digit minutes for surface wounds of moderate severity, and began to push toward the next category.
Internal injuries.
The difference between surface healing and internal healing was not simply depth. He had expected depth to be the primary variable — that he would need more energy and more time for injuries that were further from the surface, and that the technique would scale linearly from what he had already developed. He was wrong. The difference was qualitative rather than quantitative. Internal injuries required a different orientation of the healing sense entirely — not the outward-facing push that addressed surface wounds but an inward-listening quality, a way of extending the healing perception into the body rather than applying it to the body's exterior.
He could not see what he was healing when it was internal. Not with eyes, not with Shadow's inverted vision, not with any ordinary perception. He had to feel it.
This was, he discovered, the real challenge — and also, unexpectedly, the most interesting part. Developing the internal healing sense was less like learning a technique and more like developing a faculty, the way learning to hear nuances in music was less about the mechanics of listening and more about training the ear to perceive distinctions it had previously been unable to register. He was training a sense he hadn't fully had. The process was less a progression of technique and more a slow opening, each session extending the range and resolution of the healing perception a small but real amount.
He healed a Stone Boar cub with a rib fracture he had identified through observation, not through causing the injury — the cubs in the deep forest were frequently injured in play and parental discipline in ways that ranged from trivial to serious. He healed a Vine Serpent with an internal bruising injury he had detected through diagnostic pulse and then spent four days addressing through nightly sessions with Shadow in the branches above its resting site, which required maintaining his connection across a thirty-foot vertical gap and was more technically demanding than anything he had attempted.
He healed a Thornback Boar with a deep abdominal injury — the most complex internal work he had yet attempted — and learned in the process that healing deep injuries in large creatures required not just the healing energy but a specific kind of structural guidance, a way of telling the body's own repair processes what architecture to rebuild toward rather than simply providing energy and hoping the body's natural inclination did the rest.
He had not known he was going to learn this. He discovered it when the first attempt produced a healed-but-wrong result — the tissue had closed but had closed improperly, building scar formation in a pattern that would have impaired function over time. He had identified this through a follow-up diagnostic pulse and spent three subsequent sessions correcting it, which took longer than the original healing because he was working with tissue that had already organized itself incorrectly rather than tissue that was still open and available.
He filed this under: mistakes that were worth making because they taught things that success would not have.
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