Towers of Heaven (Towers of Heaven, #1)

One day, six towers appear on Earth. Each one stands hundreds of stories tall, and are invulnerable to all attacks. At the base of each tower is a portal, welcoming in all who dare enter it.

All sorts of magical monsters can be found inside the towers. Even treasure, magic and superhuman strength can be acquired. The problem is that the towers aren't a friendly place. Even worse, the towers sometimes release waves of monsters to attack Earth. ... more>>