赵恒打算试验一下自己丹田处的神秘炉子，然后运灵气在丹田处，一刻钟，两刻钟，一个时辰，两个时辰后赵恒终于放弃了，丹田处的神秘炉子没有一点反应。好像这只是自己睡着时候被别人恶作剧纹的一个青。
这兴奋劲过后赵恒发现肚子更加饿，哎！炼气期弟子无法辟谷。赵恒决定还是先去填饱肚子再说吧。
赵恒决心弄懂这个神秘炉子的秘密。接下来来的几天里赵恒都把自己关在屋子里面研究这个炉子。可是不管用什么方法炉子就是纹丝不动。
也不可能去问同门师兄弟或者长辈，这样不打自招身上的秘密等于给自己找来无穷的麻烦和危险。在研究第五天无果后，赵恒决定暂时放一下。反正在丹田处的炉子对自己也没有任何坏处。
赵恒恢复了平常心，去矿井挖矿石，完成任务后继续修炼，看能不能突破炼气期二层。
这天赵恒修炼的时候拿了一块低阶灵石吸纳里面的灵气。灵气不断的从手中的灵石传入，一个柱香时间后，手中的灵石化为齑粉，显然灵气已经被吸纳完。赵恒有些肉疼的看这些粉末。突然想起什么:自己体内怎么法力没有补满，记得之前一块低阶灵石足以补满身上的法力。难道被那个炉子吸收了。
想到这个赵恒心中一动，隐约想起该怎么做。再从怀里摸出一块低阶灵石，一柱香后，手中的灵石灵气全无。奇怪了，自己身上的法力还是没有补满，仿佛无底洞。赵恒看了自己身上这个刺青模样的炉子。青色的炉子上面有一小个地方颜色变深了，本来刺青炉子是淡淡的青色。不细看根本没有发现。难道灵气都被这个炉子吸收完了，赵恒想到。
接下来赵恒身上仅有的五块低阶灵石全部被吸纳完了，炉子的深青色面积居然有拇指大，大约占了炉子面积是二十分之一。
每个月只能挖矿所得的报酬是四五块低阶灵石。当初赵恒已经拿绝大部分灵石换取炼气期修仙者用的固本培元丹。
赵恒决定到矿井里面做实验，反正只要不把灵石带出来，至于神秘炉子，因为人体非常奇妙，他人体内的灵力并不能直接用肉眼或者神识看到。所以神秘炉子吸纳的灵气根本不用害怕别人察觉到。
这天赵恒挖出的灵矿都比往常多，赵恒在无人看到的时候，就偷偷吸纳灵矿的灵气。当神秘炉子变成青墨色的时候，就再也无法吸纳任何灵气。赵恒统计灵石的数目刚好是100。而自己的身体才可以补充灵气，只用一块低阶灵石就补满体内亏空的灵气。
一百块代表什么呢？赵恒思考着这个数字的意义。该不会是...
修仙界的通用货币——灵石。标准换算是100块低阶灵石换1块中阶灵石，100块中阶灵石换1块高阶灵石。100块高阶灵石换1块极品灵石。这是根据灵石里面的灵气决定的，100块低阶灵石的灵气数目刚刚好是1块中阶灵石里面的灵气数量。当然没有人会傻乎乎的拿1块中阶灵石去换100块低阶灵石。虽然灵气相等，但是中阶灵石里面更加浓缩的灵气，修仙者吸纳更快，效率更高。而且中阶灵石，高阶灵石对布阵，炼丹炼器等都有更重要的作用。拿来做打坐修炼那简直是暴殄天物。
这些都是修真界的基本常识，刚到云霞宗的时候，赵恒等低阶弟子就被那些‘前辈高人’告知了。
当赵恒从矿井出来的时候上交任务的100块低阶灵石。守卫灵石执法队例行检查，赵恒身上当然一切如常。并没有偷拿灵石，如果执法队知道赵恒偷吸收了相当于100块低阶灵石的灵气。赵恒会不会被当场就地正法。
回到住所赵恒再试验身体的神秘炉子。可是这些灵气并不能直接释放出来修炼。刚好100块低阶灵石的量然后再怎么也吸收不了。难道和中阶灵石有关。
赵恒去找王平借来几块低阶灵石，王平非常不舍得借。在赵恒承诺一个月后多还一块后才恋恋不舍借给了赵恒4块低阶灵石，这也是王平攒了两三个月才攒下来的。平时修炼是不可能乱用的。
赵恒运行丹田神秘炉子内的灵气注入借来的低阶灵石里面，慢慢的灵石越来越亮，赵恒有点兴奋了，突然砰的一声，灵石裂成几块。还好赵恒见机行事，赶紧扔掉手中的灵石，不然估计手会被炸伤。
显然低阶灵石没法承受那么多的灵气。再看丹田处的神秘炉子已经完全变成淡淡的青色。灵气全无的样子。赵恒说不出肉疼，101块的低阶灵石就这样报废了，。空气中浓郁的灵气很快消散了。就算赵恒马上修炼也没有用处。
自己是有点心急吃不了热豆腐了。一般修仙者炼器需要炼器的炉子，炼丹也需要对应的炼丹炉，制符等都需要专用的炉子。可能是压缩灵气的时候缺少了容器——炉子。
炼丹炉或者炼器炉都需要先天真火才能炼丹和炼器，可是先天真火需要筑基期才能使用。也就是说自己没法‘炼制’中阶灵石。
接下来的几次，赵恒不甘心再试验几次，毫无例外都是灵石破碎而告终。
难道自己的一条‘发财’之路被阻断了，要知道只要可以合成中阶灵石，就可以拿去兑换100多块低阶灵石，中阶灵石在黑市上甚至可以换到130块低阶灵石。
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