Alex had to go through his chest with his spiritual sense for a while before he found anything resembling what he had been looking for. He had tried to do the same with his spiritual sense many times before and had failed each time.
However, this time around, with such a strong Spiritual sense, he could finally find it deep in his chest, close to his heart. It remained hidden so well, its barrier so strong.
But Alex found it all the same this time.
His Soul Space.
As if using some very strong space laws, his Soul Space had remained hidden from even him. To find it as he had, he had required not just a strong Spiritual energy, but also knowledge of Space itself. If not for his Dao, he would have had to wait for the Immortal realm before he could sense it with his Spiritual Sense alone.