炉火日夜不息，叮噹锻打声时而急促，时而缓慢，隱隱传出，引人遐想。

直到三年后的某一天，一场突如其来的大火將那片区域及附近的炼器堂烧为白地，一切痕跡似乎都隨之湮灭。

外门多了一片供人唏嘘的废墟。

而內门，却悄然多了一个名为“內炼堂“的新机构，堂主，正是姓吕。

...

禁区之內，炉火熊熊，热浪扭曲了空气。

三日期限，已过去两天两夜。

沈林与吕刚几乎未曾合眼，全身心投入到了羽纹钢的锻造之中。

过程远比想像中艰难。

即便有“羽纹钢锻造（残篇）”指引，实践仍是关卡重重。

首先是十种不同金属的熔炼合一，对火候的要求苛刻到了极致，稍有配比失调便是崩溃解体，前功尽弃。

吕刚家传的打铁经验发挥了重要作用，他对火色的判断精准异常，但融合时机的把握，仍需沈林根据脑海中那玄妙的感悟碎片进行微调。

其次是千锤百炼的摺叠锻打。

这不仅是体力活，更是对耐力、意志力、控制力的极限考验。

每一次锤击都需要保持稳定的內力值，还要沿著材料的特殊纹理计算锻打角度，將不同性质的金属层层叠加、融合。

沈林双臂早已酸痛麻木，內力消耗殆尽又调息恢復，如此循环。

吕刚更是挥汗如雨，健硕的身躯也显出了疲態，但眼中对锻造的痴迷光芒却愈发炽盛，仿佛不知疲倦。

失败在所难免。

第一日傍晚，一次控温失手，即將成型的钢胚骤然开裂，碎成数块。

第二日凌晨，因锤打力度不均，內部纹理出现紊乱，光泽暗淡。

每一次失败，都意味著需要重新熔炼、锻打，时间一分一秒流逝，压力巨大。

沈林心志坚定。

吕刚更是越挫越勇。

两人通力合作，沈林负责传授核心诀窍，观察体会內力灌注时机与大小。

吕刚则以其精湛的臂力与锤法负责具体实施。

无数次尝试、调整、失败再重来。

终於在第三日黎明前，看到了希望的曙光。

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炉火中，一块经过不知多少次摺叠锻打的钢胚渐渐冷却。

其表面不再是普通钢铁的灰暗，而是在初升朝阳透过气窗照射下，隱隱流动著一层奇异的光泽。

细看之下，刀身仿佛有无数细密、流畅的羽毛状暗纹自然天成，玄奥非凡。

“就是现在！塑形！”沈林低喝，声音沙哑却带著兴奋。

吕刚精神大振，按照沈林口述的“追风”刀样式图谱，运用各种工具，开始最后的锤炼塑形。

汗水滴落在灼热的钢胚上，发出“嗤嗤”的声响，化作白汽。

当日头完全升起，温暖的阳光洒满这片禁区时，一柄长刀终於成型！

刀身细长，弧度优美流畅，线条如疾风掠过。

通体呈现出一种暗含青光的奇异色泽，那些羽状纹路在光线下若隱若现，仿佛赋予了刀身生命。

刀锋处，寒芒凝聚，尚未开刃，便已让人感觉到一股切割空气的锐利。

沈林深吸一口气，拿起旁边一块用来测试的普通精铁锭。

他並未运足內力，只是手持“追风”，轻轻向下一划。

“噌——！”

一声轻响，如同裂帛。

那精铁锭竟被无声无息地削下薄薄一片，断面光滑如镜！