Create a Skyblock Terraria Server

Skyblock in Terraria is a special world seed, not a mod. You start on a floating island with very little and build outward. The seed is switched on when a world is created, so your server makes a new Skyblock world from the Worlds tab. This guide covers that, why it needs TShock rather than tModLoader, and combining Skyblock with other seeds on your PC.

Checked against the Terraria wiki's Skyblock and special world seed pages and TShock 6.2.1 for Terraria 1.4.5.8, October 2026.

What you need

• The TShock server. The Skyblock seed was added in Terraria 1.4.5.0. TShock 6.2.1 is built for Terraria 1.4.5.8, but tModLoader's current stable builds are based on Terraria 1.4.4, so they have no Skyblock seed. The Server software card on the Startup tab shows which one you run, and Terraria server getting started explains how to switch.
• Terraria 1.4.5.8 on your PC. Players join TShock 6.2.1 with the same version.
• No mod. The seed is built into the game.

Make the Skyblock world in the Worlds tab

1. Open your server's Worlds tab and press New world.
2. Type a Name of up to 20 letters, numbers, dashes and underscores, for example Skyblock, and pick a Size and Difficulty.
3. Type skyblock into Seed (optional). The official Terraria wiki says the seed text isn't case-sensitive.
4. Press Use it on the next start, then restart the server. It builds the world as it starts, which takes a minute or two.
5. Wait for the Console to say the server is online. Your existing worlds stay on the server, and the Worlds tab marks the one that loads on start.

The world's seed may then read as a code and a random number, such as in TShock's /worldinfo, rather than skyblock. That's normal: our test world on 31 October 2026 was built as Skyblock all the same.

What to expect

Re-Logic's 1.4.5 changelog describes Skyblock as a world without any ground, where you begin on a tiny island in the sky. The official Terraria wiki adds that a Shimmer island sits off in the distance, and that you start with few resources and build outward. The progression is different from a normal world, and the wiki's Skyblock page is the best guide to it.

Combine Skyblock with other seeds

The official Terraria wiki says typing a code into the seed box turns on a single special seed, because typing a second code switches the first one off. To get Skyblock together with others, such as Remix or Royale with Cheese, make the world on your PC instead:

1. Start Terraria 1.4.5.8 on your PC and create a new world.
2. Press the seed icon beside the World Seed box and switch on Skyblock and the other seeds in the Seed Menu.
3. Name the world with up to 20 letters, numbers, dashes and underscores, finish creating it and quit Terraria.
4. Upload the .wld file with the World Import tab. Upload a Terraria world to your server has every step, including where the file is on your PC.

Our code installs the uploaded .wld as it is and doesn't rebuild it (lib/terraria/world-import.ts).

Use special seeds on your Terraria server lists the other seeds.

If it isn't Skyblock

• The world looks normal. Check the Worlds tab: if the new or uploaded world isn't marked Loads on start, press Switch to on its row and restart. The seed only shapes a world when it's built, so it does nothing for a world that already exists.
• Your old world seems gone. A world with the same name already on the server is kept and renamed with pre-import and the date in its file name, never overwritten. Look for it in File Manager.
• You run tModLoader. Switch to TShock, as the seed isn't in tModLoader's current builds.
• Players can't join. The game and server versions must match. How to join your Terraria server helps.