Memories
The fourth, fifth, and sixth written page in the Grimoire of the Ancient didn't have any techniques.
On the contrary, they were filled with detailed information, tales, and prophecies.
Reading through them was enough to recall some fragmented memories of the past.
Zayn recalled a few people of the past, when he was still young, to be precise. The world he came from never faced something like a Realm Fusion or anything like that.
On the contrary, his world was naturally connected to a different dimension via Towers. These towers could only be entered by the 'Awakened', whose Soul, Body, and Mind were compatible with soul particles.
Upon entering the towers, one would enter the 0th Floor, also called the Tutorial.