In addition to his explorations, observations, and hunting activities, Arthur spent his days working on plans for physical transformations.
His first design involved his hands. In this drawing, he depicted his palms as larger and more formidable, covered in a bony shell with protruding bone spurs resembling sharp nails. The nails on his fingers were elongated, sharpened, and possessed a metallic gleam. Arthur's initial idea was to make his hands feel like they were made of adamantium - strong and flexible. He intended to upgrade them further, possibly turning them into "Edman alloy" in the future for indestructible power.
The second transformation focused on his tail. Since his body structure didn't allow him to stand fully upright like a human, his tail became more of a hindrance. It was sensitive and fragile, causing him pain when injured. Arthur designed a long, segmented tail extending from his spine, gradually becoming more streamlined and ending in three retractable bone knives. This tail would provide balance and combat capability, making him look more imposing.
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The third plan wasn't a local transformation but a full-body enhancement. Arthur drew a test tube containing a blue substance, resembling the "Extremis virus" from movies and games. He chose it as a fortifier for his entire body. To ensure safety, he added two important definitions: "Perfect Fusion" and "No Side Effects."
Arthur's objective was to see which transformation would require the least soul energy. After trying to manifest these designs, he found that his tail could be fully realized with his current souls. However, transforming his hands only reached 20%, and the Extremis virus transformation reached a mere 5%.
Upon reflection, Arthur realized that defining his hands as steel was making the transformation more challenging, as it required a metal with biological activity. In contrast, the tail's bone material was simpler to transform. Arthur decided to begin with the tail transformation to eliminate his weakness.
As he saved the tail transformation, a tingling sensation traveled along his spine, followed by an uncomfortable itch. Arthur resisted the urge to move, knowing it was best to remain still. After some time, the itchiness disappeared, replaced by a peculiar sense of power.