Theoretical Weapons Exist in Fantasy Worlds

The protagonist can use everything with a name for his own use, modify the truth, teleport through time and space, judge the life and death of others... It's all a matter of course. But by accident, the protagonist travels to a fantasy world. The protagonist has no choice but to use his own personal abilities to collect information in this world and find a way back. But the fantasy world is far more complicated than he imagined... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.