Versatile Mage: the God of Slaughter, Rules the World!

Shuangwen After traveling through time as a full-time mage, Takano awakened to the space system for the first time and was admitted to the Pearl Academy under special circumstances. Just after his birthday, he got an apocalyptic savior system! Takano is in the magical world, what's the point of giving him an apocalyptic system? But soon, the system gave him an invincible domain based on his abilities. As long as it is within his domain space, it will be useless for anyone to come, and this space domain can also expand! Takano accidentally expanded the scope to the Holy City. Within my domain is my territory. If you step into my territory, there is only one outcome. "You can die!"