Terraria tModLoader Official Steam Trailer

That's right, tModLoader will arrive on Steam as a free DLC for Terraria alongside Journey's End on May 16th, 2020.

Though fully-integrated official mod support is not something that is feasible within the Terraria codebase, tModLoader has served faithfully as that "bridge" between the main game and the amazing library of player-created mods that exists for Terraria. With this launch, modding has never been more visible or accessible for Terrarians - so, if you have not ever tried out modded Terraria, there is no time like the present!

The launch version of TML for Steam is currently based on the 1.3.5 version of the game - as are all of the currently-available mods out there. This will allow for players to continue to enjoy modded Terraria uninterrupted while they can also separately dive into all that Journey's End/1.4 has to offer on the vanilla side of the fence. The TML Team will be working diligently to get a 1.4-tier TML out as quickly as possible on Steam so that, as mods are updated to the 1.4 standard, support for them will already be available.