Luke Rinje 卢克的聚光镜
The Castle of the Dead wasn't visible to Hilder because Luke Rinje from the optics research center used a giant speculum to reflect light in such a way that the castle became invisible.
The speculum was big enough to catch even the smallest amount of light and deliver it to Luke, helping him recover his full strength. After the Castle of the Dead became attached to Empyrean, the speculum started gathering so much light that Luke's creatures could barely survive. Luke needed a creature of darkness to neutralize the light of Empyrean, and among Luke's creatures of darkness, Argos has the highest tolerant to light. He equipped Argos with small speculums and solved all his problems.
好奇赫尔德为什么没有发觉寂静城的存在吗?其实很简单，卢克早已想好了对策，他在寂静城的顶端建造一个名为“卢克的聚光镜”的光学研究所，运用自己建造的巨大反光镜，将所有的光线反射、曲折后，令整个寂静城如同海市蜃楼一样从魔界消失。这个反射镜同时还能把魔界周围微弱的光线聚集成大量的能量传递给卢克，帮助他恢复力量。但在寂静城成功降落到天界后，天界充足的光线被反射镜聚集成无比巨大的能量，由于能量过于巨大，卢克无法承受这股强大能量。所以卢克需要的一个中和光能量的黑暗体存在，于是他重新制作了一个暗之创造物---阿尔高斯，并给他安装了一个小型散射镜，顺利解决了能量超负荷的问题。
