Progression system (Inspired by Twilight Forest mod for Minecraft). In the progression system, the player would be blocked off from some areas until they completed certain parts of the game. Also note that this is a concept and is open to change. The only areas available to the player in the start of the game are the plains/forest biomes and snow biome. Underground you would be inflicted with blindness, the Jungle would be filled with impenetrable red or purple vines, depending on the world evil the corruption/crimson would be covered in rain that would either be green (Corrupt) or red (Crimson). Space would inflict the player with freezing and suffocation, slowing them down and killing them. In order to obtain access to the desert, the player would need to kill Primordial Frost. In the desert, the player would fight the Antlion King, unlocking the underground desert. In the underground desert, the player would need to find and kill specific enemies in order to lift the rain spell upon the evil biome. Then, battling the respective boss would unlock the underground. Next, killing Skeletron would unlock the jungle, where you seek out and kill the elusive (Insert miniboss here). This will unlock space, where you kill (Dracus? IDK). then you may enter the underworld, previously protected by burning air. Then, obviously, you kill the wall of flesh.
For the Terraria Ultraterror mod.
