'The gate of Castle of Black Iron?'
'The stars of trouble-reappearance situations?'
After hearing Heller's words, Zhang Tie became stunned. Closely after that, he understood Heller's meaning.
Zhang Tie immediately remembered that whenever he took a trouble-reappearance fruit, one more hexagon star would appear on the arch door of Castle of Black Iron in his mind sea which represented the new trouble-reappearance situation.
When Zhang Tie caught sight of the first hexagon star which represented the trouble-reappearance situation on the arch door, he felt it was pretty marvelous. Over the past 10 years, as he took more and more trouble-reappearance fruits, his spiritual energy grew increasingly stronger. Gradually, he could access to Castle of Black Iron as easily as taking a breath. Therefore, Zhang Tie gradually forgot about the stars.
