You cannot roll back to 1.0.0 on Steam easily, as the depot system doesn't always support launch builds. However, dedicated archivists have preserved it.
The best gear in the game was (Hellstone) and the Molten Fury bow or Fiery Greatsword . The Nights Edge (the combined sword of fire, grass, bone, and light) was the ultimate weapon—a cool secret for dedicated players.
: While the game is now on version 1.4.4+, some players use the Game Launcher or Steam's console to downgrade to 1.0.0 for a "retro" challenge.