Sorcerer In Non-Fantasy

I am a sorcerer that has reached the peak of magical power and can use any forms of magic be it arcane, tier, divine, cursed, forbidden, etc. I live secular in a dense forest filled with different monsters, beasts and other beings. My residence in a tower made from special rare materials that can be shrinked to carry in pocket or can be released in land, water, air or space to its real size. Inside my tower the space is enlarged to occupy many floors and rooms for my activities. One day, me with my tower got teleported to another world that does not contain any form of magic nor magical creatures. It is a world in its medieval times during swords were main form of weapon. My tower in my pocket and I am in a hill looking towards a war happening in a distant plain land.