"Open up!" Danny roared as he slammed his fist into the bronze door. A surge of internal energy exploded from his body.

The door shook with a deafening boom, and dust scattered, but nothing unusual happened. The symbols on its surface flickered briefly before fading.

"Hmm?" Danny froze as he stared at the undamaged door in disbelief.

With his natural strength and the power his techniques granted him, he had expected the bronze door to shatter easily. But what he saw before him completely de