If you need to change anything about the terrain itself, TEdit is the industry standard. It functions like "MS Paint for Terraria," allowing you to draw blocks, walls, and liquids directly onto your world file.
A Terraria editor is a third-party tool that allows players to modify and customize their Terraria world. It provides a user-friendly interface to edit various aspects of the game world, including terrain, structures, NPCs, and more. With a Terraria editor, you can create complex designs, modify existing structures, or even generate entirely new worlds.
His breath caught.
Kaelen pressed his palm against the floating glass panel, and the world of Terraria —his world—held its breath.