Castle of Black Iron was Zhang Tie's most powerful trump card and reliance. As long as he could use Castle of Black Iron, he would tide over difficulties one after another. However, when Zhang Tie wanted to use Castle of Black Iron in this strange place, he found that he couldn't. Therefore, he became a bit flurried at a stroke.
"Heller, heller, could you hear me?" Zhang Tie hurriedly called Heller. Based on his experience, even if Castle of Black Iron didn't work, he could still contact Heller. As long as the marvelous arch door of Castle of Black Iron was in his mind sea, he would be able to contact Heller.
"I'm here, Castle Lord. Congratulations, Castle Lord, you've survived the combat..."
Heller's voice was as calm as before. Despite being a bit emotional, Heller's words finally made Zhang Tie a bit calm.
"What happened? Why couldn't I use items in Castle of Black Iron? The space-teleportation function of Castle of Black Iron becomes ineffective!"
