Lavender

A few years ago, portals began to appear in cities around the world. Monsters emerged from these portals, which came to be known as dungeons. Within the dungeons, modern weapons and explosives don't function, but magic does. In order to deal with the momsters, teams of adventurers venture in and fight the monsters inside. When defeated, the monsters disappear, leaving the crystal cores and other treasures that the adventurers seek. You are a new adventurer exploring a dungeon on your own when you encounter Lavender.