Gregtech-New-Bastards/.minecraft/config/roguelike_dungeons/settings/theme_mesa.json

{
  "name": "theme_mesa",
  "levels": {
    "0": {
      "theme": {
        "base": "ETHOTOWER"
      }
    },
    "1": {
      "theme": {
        "base": "ETHOTOWER"
      }
    },
    "2": {
      "theme": {
        "base": "CRYPT"
      }
    },
    "3": {
      "theme": {
        "base": "CRYPT"
      }
    },

    "4": {
      "theme": {
        "base": "NETHER"
      }
    }
  }
}