The journey back to Thornbridge took two full days instead of the three hours it had taken to reach the caves. Arin could barely walk for more than ten minutes without losing balance, and his attempts at speech remained garbled and difficult to understand. The party had to camp overnight in the hills east of the city, giving him time to practice basic movement.

  "Lift your foot higher," Kelsa instructed as Arin tried to navigate over a fallen log. "You keep catching your toe because you're not clearing the obstacle."

  Arin focused on the movement, trying to make his new leg respond properly. The foot caught anyway, and he stumbled forward. Torvin grabbed his arm to steady him.

  "This is harder than it looks," the dwarf said with sympathy. "Ye're essentially a newborn learning to walk, except you've got the mind of an adult telling ye you should already know how."

  That was exactly the problem. Arin's consciousness expected his body to respond like his slime form, flowing and adapting instantly. But the humanoid form had structure, had bones (sort of), had joints that only moved in certain directions.

  He tried again, this time lifting his knee higher, and managed to step over the log without catching.

  "Better!" Essa said encouragingly. "You're getting it."

  By evening of the first day, Arin could walk relatively smoothly on flat ground, though anything requiring climbing or complex movement still defeated him. His speech had improved marginally, enough that he could form simple three or four-word sentences that were mostly comprehensible.

  "Tired," he managed to say as they set up camp. "Form... costs... essence."

  It was true. The constant essence drain from maintaining humanoid form was noticeable. He'd started the day at 180/200 essence, and now after twelve hours, he was down to 168/200. Not critical, but a reminder that this new form came with costs.

  "Can you shift back?" Kelsa asked. "Return to slime form?"

  Arin nodded and focused on the sensation of his core, the way essence flowed through his being. He triggered Form Shift.

  [-10 Essence]

  His humanoid body collapsed, structure dissolving as his mass returned to its natural slime state. The relief was immediate, like taking off armor that had been too tight.

  [Current Form: Slime]

  [Essence: 158/200]

  "That looked painful," Torvin observed.

  "Not... painful," Arin formed letters on the ground. "Just... different. Wrong somehow."

  "Probably because slime form is what you're used to," Essa suggested. "Give it time. I imagine the humanoid form will feel more natural the more you use it."

  They'd left the Crimson Hawks at the Mourning Caves' entrance, where the other party was dealing with their own mixed emotions about the mission's outcome. They'd killed a Level 14 Wraith Lord, which was an incredible achievement, but lost the healing artifact that could have saved Kira's sister.

  Arin's core pulsed with guilt every time he thought about it. That woman had sacrificed her sister's life for him.

  "Stop dwelling on it," Kelsa said, somehow reading his thoughts from the way his mass rippled. "Kira made her choice. She didn't have to use that artifact on you, but she chose to anyway. Honor that choice by making it worth something."

  W I L F I N D W A Y T O S A V E H E R S I S T E R

  "Maybe you will," Kelsa said. "But first, you need to master this new form. Because if you can pass as a humanoid, even a strange one, that opens up opportunities we've never had before."

  That night, Arin practiced shifting between forms multiple times, getting used to the sensation and the essence cost. Slime to humanoid cost 10 essence. Humanoid to slime also cost 10 essence. Each transformation took about thirty seconds of concentration.

  By the time he settled in to rest, his essence was down to 98/200 from all the practice shifting.

  The second day brought new challenges. They were approaching Thornbridge, which meant they'd need to decide how to handle Arin's transformation. His slime form had been grudgingly accepted in the city, but a humanoid slime was something else entirely.

  "We need to present this to Guild Master Theron as soon as possible," Kelsa said as the city walls came into view. "Let him make the official determination about how to handle your registration."

  "Should I shift back to slime form?" Arin asked, the words coming out slowly but clearly enough. "Less... attention."

  Kelsa considered it, then shook her head. "No. If we hide this and word gets out later, people will think we were deceiving them. That's worse than a little panic now."

  "She's right," Torvin agreed. "Better to walk in openly, let them see ye can shift between forms, prove ye're not some new monster pretending to be the old one. Transparency builds trust. Eventually."

  "There will be fear at first," Essa added gently. "But in the long term, a form that can speak and shake hands? That opens doors your slime form never could. Meetings with nobles, investigations in cities, conversations that don't require spelling out every word. Once people get used to it, this form will make your life easier, not harder."

  "Short... term pain," Arin managed. "Long... term gain."

  "Exactly." Kelsa nodded. "So we walk in with our heads high, show them there's nothing to hide, and let Theron handle the official response."

  Arin had been practicing in humanoid form for the past hour, wanting to arrive able to walk without stumbling. He was getting better, could manage a steady pace without falling, though anything requiring quick movement or balance still defeated him.

  "Words," Essa encouraged as they continued toward the city. "Keep practicing while we walk."

  "Hhhello," Arin tried. Then, "Mmmmy name... Arin."

  "Good! Try a longer sentence."

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  "I... am... adven... adventurer." The word adventurer came out mostly correct, though he had to concentrate hard on each syllable.

  They reached Thornbridge's gates as the sun climbed toward noon. The guards' reactions to Arin's humanoid form were immediate and dramatic.

  "Halt! What is that thing?" One guard's hand went to his sword.

  "This is Arin," Kelsa said calmly. "He's a registered Bronze rank adventurer with the guild. You have him on your records as an Adaptive Slime."

  "That's not a slime! That's... I don't know what that is!"

  "He evolved," Kelsa explained. "It happened while we were clearing a dungeon. Guild Master Theron knows about him, he just hasn't seen this form yet."

  The guards conferred nervously, clearly uncertain how to handle the situation. Finally, one went to fetch a superior while the others kept their weapons ready but not drawn.

  "This is going to be a problem," Torvin muttered.

  Ten minutes later, a captain of the guard arrived, a stern-faced woman who examined Arin with professional assessment rather than fear.

  "You're the slime that killed the Rat King?" she asked.

  "Yesss," Arin managed.

  "And you've somehow gained humanoid form?"

  "Evolved," Arin said, then concentrated hard on the longer explanation. "Sssystem... gave... new... form."

  The captain studied him for a long moment. "You can shift back to slime form?"

  Arin nodded and triggered Form Shift. His humanoid body collapsed into his familiar red slime shape.

  [-10 Essence]

  "And back to humanoid?"

  Another shift, essence spent, structure reforming.

  [-10 Essence]

  The captain's expression remained neutral, but Arin saw her shoulders relax slightly. "Guild Master Theron will want to see this. I'll escort you there personally."

  The journey through Thornbridge's streets drew attention like nothing Arin had experienced before. His slime form had caused stares and wariness, but his humanoid form triggered outright alarm. People backed away, parents pulled children close, and several shops quickly closed their doors.

  "Stay calm," the guard captain called out to concerned citizens. "This is a registered adventurer under guild supervision. No threat to anyone."

  But the damage was done. By the time they reached the guild hall, a small crowd had gathered, and Arin could hear the whispered conversations.

  "—unnatural—"

  "—monster trying to look human—"

  "—shouldn't be allowed in the city—"

  Guild Master Theron was waiting at the hall entrance, clearly having been alerted to their arrival. His expression was carefully neutral as he examined Arin's humanoid form.

  "Inside," he said simply. "My office. Now."

  They filed into Theron's office, and the guild master closed the door firmly behind them. He gestured for them to sit, though there weren't enough chairs. Arin remained standing, his humanoid legs still feeling strange and unstable.

  "Explain," Theron said. "Everything. From the beginning."

  Kelsa recounted the past two days, starting with Arin's pursuit of the Crimson Hawks to the Mourning Caves, the battle with the Wraith Lord, and Arin's near-death experience that triggered his evolution. Theron listened without interruption, his expression growing more serious with each detail.

  "So you're saying," he said when Kelsa finished, "that this slime achieved species evolution by nearly dying while protecting other adventurers?"

  "That's what the System told him," Kelsa confirmed. "The notification said evolution conditions were met, something about sacrifice and protection."

  Theron turned to Arin. "Can you speak? Actually form words?"

  "Yesss," Arin said, concentrating on keeping his sounds clear. "Still... learning... how."

  "But you understand everything being said?"

  "Yesss. Same... mind. Different... body."

  Theron leaned back in his chair, his expression thoughtful. "This is unprecedented in my experience. I've heard of slimes evolving into more dangerous forms—greater slimes, acid slimes, things like that. But I've never heard of one evolving into a humanoid variant."

  "What does this mean for his guild status?" Kelsa asked.

  "That depends." Theron looked at Arin directly. "Can you take contracts in this form? Function as an adventurer?"

  "Learning... to... walk," Arin admitted. "Need... practice."

  "But you can shift back to slime form at will?"

  Arin nodded and demonstrated, collapsing into his familiar shape.

  "And how long can you maintain each form?"

  B O T H F O R M S C O S T E S S E N C E

  H U M A N O I D O N E P E R H O U R S L I M E N O N E

  "So humanoid form is more expensive." Theron nodded slowly. "That's actually good. It means you're not just a monster pretending to be human. There's a real cost to maintaining that shape."

  He stood and walked to the window, looking out at Thornbridge's streets. "Here's my ruling. You're still a registered Bronze rank adventurer, but your humanoid form needs to be documented separately. We'll treat you as having two registered forms, both legal for guild work."

  "What about the city?" Kelsa asked. "People were panicking in the streets."

  "That will take time," Theron admitted. "Your slime form was strange but categorizable. This humanoid form is going to frighten people more, not less. My recommendation is that you continue using slime form for most situations and only shift to humanoid when necessary."

  Arin shifted back to humanoid form to speak. "Under... stand. Will... be... careful."

  "There's one more thing," Theron said. "Your coordination trial is scheduled for tomorrow. Are you capable of participating in this form?"

  "Prob... ably not," Arin admitted.

  "Then you'll participate in slime form, same as your individual assessment. The humanoid form can be explored after you've achieved Silver rank and have time to properly train with it."

  That made sense. Arin had spent months mastering combat in his slime form. The humanoid form was barely two days old and still difficult to control. Trying to fight in it would be suicide.

  After they left Theron's office and returned to their inn, the party gathered in Kelsa's room to discuss the situation privately.

  "This changes everything," Torvin said. "If ye can pass as humanoid, even a strange one, ye can go places slimes can't. Do things we've never been able to do."

  "But it's going to take time," Essa added. "You need to learn to walk properly, to speak clearly, to use your hands and manipulate objects. All things humans take for granted that you're starting from nothing."

  "How... long?" Arin asked.

  "Weeks," Kelsa estimated. "Maybe months to be truly comfortable. But you're intelligent and motivated. You'll learn faster than a child would."

  They discussed plans for the future, how to incorporate Arin's new capabilities into the party's strategies. Eventually, exhaustion caught up with everyone, and they dispersed to their rooms.

  Arin remained in humanoid form as he descended to the inn's cellar, wanting to practice movement and simply existing in this new shape. He sat on the floor, his back against the wall, and examined his hands in the lantern light.

  Fingers. Individual fingers he could move separately. It was fascinating, strange, and wrong all at once.

  He tried speaking, just to himself, practicing the sounds without anyone to judge his failures.

  "My name is Arin." It came out mostly clear.

  "I am an adventurer." Better.

  "I will learn this form." Almost perfect.

  Then, quietly, words meant only for himself and the memory of his creator:

  "Levi... would have... loved this. The... ability to... walk. To talk. To be... something close... to human."

  His core pulsed with mixed emotions. Pride at achieving evolution, guilt about the cost, determination to master this new form, and grief for the person who'd given him everything but would never see what he'd become.

  Tomorrow would bring the coordination trial and hopefully the Silver rank. After that, he'd have time to truly explore his new capabilities.

  But tonight, Arin simply sat in the dimly lit cellar and practiced being human. One movement, one word, one slight improvement at a time.